51272691 has 4 divisors (see below), whose sum is σ = 68363592. Its totient is φ = 34181792.

The previous prime is 51272687. The next prime is 51272743. The reversal of 51272691 is 19627215.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51272691 - 2² = 51272687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51272671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8545446 + ... + 8545451.

It is an arithmetic number, because the mean of its divisors is an integer number (17090898).

Almost surely, 2^51272691 is an apocalyptic number.

51272691 is a deficient number, since it is larger than the sum of its proper divisors (17090901).

51272691 is a wasteful number, since it uses less digits than its factorization.

51272691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17090900.

The product of its digits is 7560, while the sum is 33.

The square root of 51272691 is about 7160.4951644422. The cubic root of 51272691 is about 371.5027536603.

The spelling of 51272691 in words is "fifty-one million, two hundred seventy-two thousand, six hundred ninety-one".