51424731 has 24 divisors (see below), whose sum is σ = 75563280. Its totient is φ = 33697536.

The previous prime is 51424727. The next prime is 51424733. The reversal of 51424731 is 13742415.

It is not a de Polignac number, because 51424731 - 2² = 51424727 is a prime.

It is a super-2 number, since 2×51424731² = 5289005916844722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51424695 and 51424704.

It is not an unprimeable number, because it can be changed into a prime (51424733) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 220591 + ... + 220823.

It is an arithmetic number, because the mean of its divisors is an integer number (3148470).

Almost surely, 2^51424731 is an apocalyptic number.

51424731 is a deficient number, since it is larger than the sum of its proper divisors (24138549).

51424731 is a wasteful number, since it uses less digits than its factorization.

51424731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555 (or 552 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 51424731 is about 7171.1038899182. The cubic root of 51424731 is about 371.8695996297.

The spelling of 51424731 in words is "fifty-one million, four hundred twenty-four thousand, seven hundred thirty-one".