1051056561 has 4 divisors (see below), whose sum is σ = 1401408752. Its totient is φ = 700704372.

The previous prime is 1051056551. The next prime is 1051056563. The reversal of 1051056561 is 1656501501.

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 not a de Polignac number, because 1051056561 - 2⁵ = 1051056529 is a prime.

It is a super-2 number, since 2×1051056561² = 2209439788842293442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1051056563) 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, 175176091 + ... + 175176096.

It is an arithmetic number, because the mean of its divisors is an integer number (350352188).

Almost surely, 2^1051056561 is an apocalyptic number.

It is an amenable number.

1051056561 is a deficient number, since it is larger than the sum of its proper divisors (350352191).

1051056561 is an equidigital number, since it uses as much as digits as its factorization.

1051056561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350352190.

The product of its (nonzero) digits is 4500, while the sum is 30.

The square root of 1051056561 is about 32420.0024830351. The cubic root of 1051056561 is about 1016.7371583241.

The spelling of 1051056561 in words is "one billion, fifty-one million, fifty-six thousand, five hundred sixty-one".