51631197 has 4 divisors (see below), whose sum is σ = 68841600. Its totient is φ = 34420796.

The previous prime is 51631183. The next prime is 51631211. The reversal of 51631197 is 79113615.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (51631183) and next prime (51631211).

It is a cyclic number.

It is not a de Polignac number, because 51631197 - 2¹⁵ = 51598429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51631127) 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, 8605197 + ... + 8605202.

It is an arithmetic number, because the mean of its divisors is an integer number (17210400).

Almost surely, 2^51631197 is an apocalyptic number.

It is an amenable number.

51631197 is a deficient number, since it is larger than the sum of its proper divisors (17210403).

51631197 is a wasteful number, since it uses less digits than its factorization.

51631197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17210402.

The product of its digits is 5670, while the sum is 33.

The square root of 51631197 is about 7185.4851610730. The cubic root of 51631197 is about 372.3666101980.

It can be divided in two parts, 516 and 31197, that added together give a palindrome (31713).

The spelling of 51631197 in words is "fifty-one million, six hundred thirty-one thousand, one hundred ninety-seven".