2051531340 has 96 divisors (see below), whose sum is σ = 6000583680. Its totient is φ = 523036416.

The previous prime is 2051531323. The next prime is 2051531347. The reversal of 2051531340 is 431351502.

2051531340 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×2051531340³ (a number of 29 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2051531340.

It is not an unprimeable number, because it can be changed into a prime (2051531347) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 173497 + ... + 184943.

It is an arithmetic number, because the mean of its divisors is an integer number (62506080).

Almost surely, 2^2051531340 is an apocalyptic number.

2051531340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2051531340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3000291840).

2051531340 is an abundant number, since it is smaller than the sum of its proper divisors (3949052340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2051531340 is a wasteful number, since it uses less digits than its factorization.

2051531340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11591 (or 11589 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 2051531340 is about 45293.8333551048. The cubic root of 2051531340 is about 1270.6503251677.

Adding to 2051531340 its reverse (431351502), we get a palindrome (2482882842).

The spelling of 2051531340 in words is "two billion, fifty-one million, five hundred thirty-one thousand, three hundred forty".