1051211540 has 48 divisors (see below), whose sum is σ = 2301602688. Its totient is φ = 402939264.

The previous prime is 1051211533. The next prime is 1051211543. The reversal of 1051211540 is 451121501.

1051211540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1051211540² = 2210091403658343200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1051211543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34049 + ... + 57111.

It is an arithmetic number, because the mean of its divisors is an integer number (47950056).

Almost surely, 2^1051211540 is an apocalyptic number.

1051211540 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 1051211540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1150801344).

1051211540 is an abundant number, since it is smaller than the sum of its proper divisors (1250391148).

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

1051211540 is a wasteful number, since it uses less digits than its factorization.

1051211540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23168 (or 23166 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 1051211540 is about 32422.3925705676. The cubic root of 1051211540 is about 1016.7871287284.

The spelling of 1051211540 in words is "one billion, fifty-one million, two hundred eleven thousand, five hundred forty".