51477731 has 2 divisors, whose sum is σ = 51477732. Its totient is φ = 51477730.

The previous prime is 51477721. The next prime is 51477733. The reversal of 51477731 is 13777415.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51477731 - 2¹⁸ = 51215587 is a prime.

It is a super-2 number, since 2×51477731² = 5299913577816722, which contains 22 as substring.

Together with 51477733, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 51477691 and 51477700.

It is not a weakly prime, because it can be changed into another prime (51477733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25738865 + 25738866.

It is an arithmetic number, because the mean of its divisors is an integer number (25738866).

Almost surely, 2^51477731 is an apocalyptic number.

51477731 is a deficient number, since it is larger than the sum of its proper divisors (1).

51477731 is an equidigital number, since it uses as much as digits as its factorization.

51477731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20580, while the sum is 35.

The square root of 51477731 is about 7174.7983246918. The cubic root of 51477731 is about 371.9973093997.

The spelling of 51477731 in words is "fifty-one million, four hundred seventy-seven thousand, seven hundred thirty-one".