1157445831 has 4 divisors (see below), whose sum is σ = 1543261112. Its totient is φ = 771630552.

The previous prime is 1157445787. The next prime is 1157445841. The reversal of 1157445831 is 1385447511.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1157445831 - 2²⁵ = 1123891399 is a prime.

It is a super-2 number, since 2×1157445831² = 2679361703398561122, 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 1157445831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1157445841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192907636 + ... + 192907641.

It is an arithmetic number, because the mean of its divisors is an integer number (385815278).

Almost surely, 2^1157445831 is an apocalyptic number.

1157445831 is a deficient number, since it is larger than the sum of its proper divisors (385815281).

1157445831 is an equidigital number, since it uses as much as digits as its factorization.

1157445831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385815280.

The product of its digits is 67200, while the sum is 39.

The square root of 1157445831 is about 34021.2555764775. The cubic root of 1157445831 is about 1049.9458266835.

The spelling of 1157445831 in words is "one billion, one hundred fifty-seven million, four hundred forty-five thousand, eight hundred thirty-one".