1264156881 has 8 divisors (see below), whose sum is σ = 1815199680. Its totient is φ = 777942672.

The previous prime is 1264156819. The next prime is 1264156903. The reversal of 1264156881 is 1886514621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1264156881 - 2⁷ = 1264156753 is a prime.

It is a super-2 number, since 2×1264156881² = 3196185239559296322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1264151881) 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 7 ways as a sum of consecutive naturals, for example, 16207101 + ... + 16207178.

It is an arithmetic number, because the mean of its divisors is an integer number (226899960).

Almost surely, 2^1264156881 is an apocalyptic number.

It is an amenable number.

1264156881 is a deficient number, since it is larger than the sum of its proper divisors (551042799).

1264156881 is a wasteful number, since it uses less digits than its factorization.

1264156881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32414295.

The product of its digits is 92160, while the sum is 42.

The square root of 1264156881 is about 35554.9839122450. The cubic root of 1264156881 is about 1081.2687652373.

The spelling of 1264156881 in words is "one billion, two hundred sixty-four million, one hundred fifty-six thousand, eight hundred eighty-one".