51275691 has 12 divisors (see below), whose sum is σ = 74190480. Its totient is φ = 34125840.

The previous prime is 51275687. The next prime is 51275713. The reversal of 51275691 is 19657215.

51275691 is a `hidden beast` number, since 512 + 7 + 56 + 91 = 666.

It is not a de Polignac number, because 51275691 - 2² = 51275687 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (51275681) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1165 + ... + 10193.

It is an arithmetic number, because the mean of its divisors is an integer number (6182540).

Almost surely, 2^51275691 is an apocalyptic number.

51275691 is a deficient number, since it is larger than the sum of its proper divisors (22914789).

51275691 is a wasteful number, since it uses less digits than its factorization.

51275691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9666 (or 9663 counting only the distinct ones).

The product of its digits is 18900, while the sum is 36.

The square root of 51275691 is about 7160.7046440975. The cubic root of 51275691 is about 371.5099991452.

The spelling of 51275691 in words is "fifty-one million, two hundred seventy-five thousand, six hundred ninety-one".