51135731 has 2 divisors, whose sum is σ = 51135732. Its totient is φ = 51135730.

The previous prime is 51135727. The next prime is 51135761. The reversal of 51135731 is 13753115.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51135731 - 2² = 51135727 is a prime.

It is a super-2 number, since 2×51135731² = 5229725969808722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51135731.

It is not a weakly prime, because it can be changed into another prime (51135761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25567865 + 25567866.

It is an arithmetic number, because the mean of its divisors is an integer number (25567866).

Almost surely, 2^51135731 is an apocalyptic number.

51135731 is a deficient number, since it is larger than the sum of its proper divisors (1).

51135731 is an equidigital number, since it uses as much as digits as its factorization.

51135731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1575, while the sum is 26.

The square root of 51135731 is about 7150.9251848974. The cubic root of 51135731 is about 371.1716717004.

Adding to 51135731 its reverse (13753115), we get a palindrome (64888846).

The spelling of 51135731 in words is "fifty-one million, one hundred thirty-five thousand, seven hundred thirty-one".