1056913921 has 4 divisors (see below), whose sum is σ = 1207901632. Its totient is φ = 905926212.

The previous prime is 1056913909. The next prime is 1056913927. The reversal of 1056913921 is 1293196501.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1056913921 - 2²⁹ = 520043009 is a prime.

It is a super-2 number, since 2×1056913921² = 2234134072807188482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1056913927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75493845 + ... + 75493858.

It is an arithmetic number, because the mean of its divisors is an integer number (301975408).

Almost surely, 2^1056913921 is an apocalyptic number.

It is an amenable number.

1056913921 is a deficient number, since it is larger than the sum of its proper divisors (150987711).

1056913921 is an equidigital number, since it uses as much as digits as its factorization.

1056913921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150987710.

The product of its (nonzero) digits is 14580, while the sum is 37.

The square root of 1056913921 is about 32510.2125646696. The cubic root of 1056913921 is about 1018.6223619382.

The spelling of 1056913921 in words is "one billion, fifty-six million, nine hundred thirteen thousand, nine hundred twenty-one".