51494078731 has 2 divisors, whose sum is σ = 51494078732. Its totient is φ = 51494078730.

The previous prime is 51494078717. The next prime is 51494078773. The reversal of 51494078731 is 13787049415.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51494078731 - 2⁹ = 51494078219 is a prime.

It is a super-2 number, since 2×51494078731² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51494078431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25747039365 + 25747039366.

It is an arithmetic number, because the mean of its divisors is an integer number (25747039366).

Almost surely, 2^51494078731 is an apocalyptic number.

51494078731 is a deficient number, since it is larger than the sum of its proper divisors (1).

51494078731 is an equidigital number, since it uses as much as digits as its factorization.

51494078731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 846720, while the sum is 49.

The spelling of 51494078731 in words is "fifty-one billion, four hundred ninety-four million, seventy-eight thousand, seven hundred thirty-one".