12811977 has 6 divisors (see below), whose sum is σ = 18506202. Its totient is φ = 8541312.

The previous prime is 12811973. The next prime is 12811987. The reversal of 12811977 is 77911821.

It can be written as a sum of positive squares in only one way, i.e., 11532816 + 1279161 = 3396^2 + 1131^2 .

It is not a de Polignac number, because 12811977 - 2² = 12811973 is a prime.

It is a super-3 number, since 3×12811977³ (a number of 22 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (12811973) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 711768 + ... + 711785.

It is an arithmetic number, because the mean of its divisors is an integer number (3084367).

Almost surely, 2^12811977 is an apocalyptic number.

It is an amenable number.

12811977 is a deficient number, since it is larger than the sum of its proper divisors (5694225).

12811977 is a wasteful number, since it uses less digits than its factorization.

12811977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1423559 (or 1423556 counting only the distinct ones).

The product of its digits is 7056, while the sum is 36.

The square root of 12811977 is about 3579.3822092646. The cubic root of 12811977 is about 233.9943566467.

The spelling of 12811977 in words is "twelve million, eight hundred eleven thousand, nine hundred seventy-seven".