51890461731 has 16 divisors (see below), whose sum is σ = 76972470400. Its totient is φ = 34549670664.

The previous prime is 51890461729. The next prime is 51890461741. The reversal of 51890461731 is 13716409815.

51890461731 is a `hidden beast` number, since 5 + 189 + 0 + 461 + 7 + 3 + 1 = 666.

It is not a de Polignac number, because 51890461731 - 2¹ = 51890461729 is a prime.

It is a super-2 number, since 2×51890461731² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51890461741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1199761 + ... + 1242258.

It is an arithmetic number, because the mean of its divisors is an integer number (4810779400).

Almost surely, 2^51890461731 is an apocalyptic number.

51890461731 is a deficient number, since it is larger than the sum of its proper divisors (25082008669).

51890461731 is a wasteful number, since it uses less digits than its factorization.

51890461731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2442815 (or 2442809 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The spelling of 51890461731 in words is "fifty-one billion, eight hundred ninety million, four hundred sixty-one thousand, seven hundred thirty-one".