131021340 has 144 divisors (see below), whose sum is σ = 405554688. Its totient is φ = 31540608.

The previous prime is 131021339. The next prime is 131021347. The reversal of 131021340 is 43120131.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131021347) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 498049 + ... + 498311.

It is an arithmetic number, because the mean of its divisors is an integer number (2816352).

Almost surely, 2^131021340 is an apocalyptic number.

131021340 is a gapful number since it is divisible by the number (10) 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 131021340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (202777344).

131021340 is an abundant number, since it is smaller than the sum of its proper divisors (274533348).

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

131021340 is a wasteful number, since it uses less digits than its factorization.

131021340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336 (or 315 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 131021340 is about 11446.4553465254. The cubic root of 131021340 is about 507.9028840744.

Adding to 131021340 its reverse (43120131), we get a palindrome (174141471).

The spelling of 131021340 in words is "one hundred thirty-one million, twenty-one thousand, three hundred forty".