51272991 has 48 divisors (see below), whose sum is σ = 93020928. Its totient is φ = 26438400.

The previous prime is 51272983. The next prime is 51272999. The reversal of 51272991 is 19927215.

It is an interprime number because it is at equal distance from previous prime (51272983) and next prime (51272999).

It is not a de Polignac number, because 51272991 - 2³ = 51272983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51272999) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 166860 + ... + 167166.

It is an arithmetic number, because the mean of its divisors is an integer number (1937936).

Almost surely, 2^51272991 is an apocalyptic number.

51272991 is a deficient number, since it is larger than the sum of its proper divisors (41747937).

51272991 is a wasteful number, since it uses less digits than its factorization.

51272991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572 (or 569 counting only the distinct ones).

The product of its digits is 11340, while the sum is 36.

The square root of 51272991 is about 7160.5161126835. The cubic root of 51272991 is about 371.5034782215.

It can be divided in two parts, 5127 and 2991, that added together give a palindrome (8118).

The spelling of 51272991 in words is "fifty-one million, two hundred seventy-two thousand, nine hundred ninety-one".