51489731 has 2 divisors, whose sum is σ = 51489732. Its totient is φ = 51489730.

The previous prime is 51489721. The next prime is 51489743. The reversal of 51489731 is 13798415.

51489731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51489731 - 2¹⁰ = 51488707 is a prime.

It is a super-2 number, since 2×51489731² = 5302384796904722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51489721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25744865 + 25744866.

It is an arithmetic number, because the mean of its divisors is an integer number (25744866).

Almost surely, 2^51489731 is an apocalyptic number.

51489731 is a deficient number, since it is larger than the sum of its proper divisors (1).

51489731 is an equidigital number, since it uses as much as digits as its factorization.

51489731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 38.

The square root of 51489731 is about 7175.6345364016. The cubic root of 51489731 is about 372.0262126478.

The spelling of 51489731 in words is "fifty-one million, four hundred eighty-nine thousand, seven hundred thirty-one".