1165311257 has 16 divisors (see below), whose sum is σ = 1357964352. Its totient is φ = 988216320.

The previous prime is 1165311247. The next prime is 1165311281. The reversal of 1165311257 is 7521135611.

It is a cyclic number.

It is not a de Polignac number, because 1165311257 - 2⁶ = 1165311193 is a prime.

It is a super-3 number, since 3×1165311257³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1165311247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6443 + ... + 48704.

It is an arithmetic number, because the mean of its divisors is an integer number (84872772).

Almost surely, 2^1165311257 is an apocalyptic number.

1165311257 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1165311257 is a deficient number, since it is larger than the sum of its proper divisors (192653095).

1165311257 is a wasteful number, since it uses less digits than its factorization.

1165311257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55288.

The product of its digits is 6300, while the sum is 32.

The square root of 1165311257 is about 34136.6556211941. The cubic root of 1165311257 is about 1052.3187628271.

Adding to 1165311257 its reverse (7521135611), we get a palindrome (8686446868).

The spelling of 1165311257 in words is "one billion, one hundred sixty-five million, three hundred eleven thousand, two hundred fifty-seven".