1157856569 has 4 divisors (see below), whose sum is σ = 1174164480. Its totient is φ = 1141548660.

The previous prime is 1157856559. The next prime is 1157856589. The reversal of 1157856569 is 9656587511.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9656587511 = 12097 ⋅798263.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1157856569 is a prime.

It is a super-2 number, since 2×1157856569² = 2681263668752903522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1157856569.

It is not an unprimeable number, because it can be changed into a prime (1157856559) 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, 8153849 + ... + 8153990.

It is an arithmetic number, because the mean of its divisors is an integer number (293541120).

Almost surely, 2^1157856569 is an apocalyptic number.

It is an amenable number.

1157856569 is a deficient number, since it is larger than the sum of its proper divisors (16307911).

1157856569 is an equidigital number, since it uses as much as digits as its factorization.

1157856569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16307910.

The product of its digits is 2268000, while the sum is 53.

The square root of 1157856569 is about 34027.2915319454. The cubic root of 1157856569 is about 1050.0700086352.

The spelling of 1157856569 in words is "one billion, one hundred fifty-seven million, eight hundred fifty-six thousand, five hundred sixty-nine".