1164256531 has 4 divisors (see below), whose sum is σ = 1164802464. Its totient is φ = 1163710600.

The previous prime is 1164256529. The next prime is 1164256549. The reversal of 1164256531 is 1356524611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1356524611 = 13 ⋅104348047.

It is a cyclic number.

It is not a de Polignac number, because 1164256531 - 2¹ = 1164256529 is a prime.

It is a super-2 number, since 2×1164256531² = 2710986539952307922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1164256501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269755 + ... + 274036.

It is an arithmetic number, because the mean of its divisors is an integer number (291200616).

Almost surely, 2^1164256531 is an apocalyptic number.

1164256531 is a deficient number, since it is larger than the sum of its proper divisors (545933).

1164256531 is an equidigital number, since it uses as much as digits as its factorization.

1164256531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545932.

The product of its digits is 21600, while the sum is 34.

The square root of 1164256531 is about 34121.2035397346. The cubic root of 1164256531 is about 1052.0011815853.

The spelling of 1164256531 in words is "one billion, one hundred sixty-four million, two hundred fifty-six thousand, five hundred thirty-one".