51972431 has 4 divisors (see below), whose sum is σ = 59397072. Its totient is φ = 44547792.

The previous prime is 51972421. The next prime is 51972439. The reversal of 51972431 is 13427915.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13427915 = 5 ⋅2685583.

It is a cyclic number.

It is not a de Polignac number, because 51972431 - 2⁶ = 51972367 is a prime.

It is a super-2 number, since 2×51972431² = 5402267168099522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51972439) 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, 3712310 + ... + 3712323.

It is an arithmetic number, because the mean of its divisors is an integer number (14849268).

Almost surely, 2^51972431 is an apocalyptic number.

51972431 is a deficient number, since it is larger than the sum of its proper divisors (7424641).

51972431 is an equidigital number, since it uses as much as digits as its factorization.

51972431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7424640.

The product of its digits is 7560, while the sum is 32.

The square root of 51972431 is about 7209.1907312818. The cubic root of 51972431 is about 373.1851414569.

The spelling of 51972431 in words is "fifty-one million, nine hundred seventy-two thousand, four hundred thirty-one".