1056615889 has 4 divisors (see below), whose sum is σ = 1207561024. Its totient is φ = 905670756.

The previous prime is 1056615881. The next prime is 1056615907. The reversal of 1056615889 is 9885166501.

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 1056615889 - 2³ = 1056615881 is a prime.

It is a super-2 number, since 2×1056615889² = 2232874273774520642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1056615881) 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, 75472557 + ... + 75472570.

It is an arithmetic number, because the mean of its divisors is an integer number (301890256).

Almost surely, 2^1056615889 is an apocalyptic number.

It is an amenable number.

1056615889 is a deficient number, since it is larger than the sum of its proper divisors (150945135).

1056615889 is an equidigital number, since it uses as much as digits as its factorization.

1056615889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150945134.

The product of its (nonzero) digits is 518400, while the sum is 49.

The square root of 1056615889 is about 32505.6285741408. The cubic root of 1056615889 is about 1018.5266081298.

The spelling of 1056615889 in words is "one billion, fifty-six million, six hundred fifteen thousand, eight hundred eighty-nine".