51155431047 has 24 divisors (see below), whose sum is σ = 84984956576. Its totient is φ = 29045480256.

The previous prime is 51155431027. The next prime is 51155431091. The reversal of 51155431047 is 74013455115.

51155431047 is a `hidden beast` number, since 5 + 1 + 1 + 5 + 543 + 104 + 7 = 666.

It is not a de Polignac number, because 51155431047 - 2⁸ = 51155430791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51155431007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2576068 + ... + 2595849.

Almost surely, 2^51155431047 is an apocalyptic number.

51155431047 is a deficient number, since it is larger than the sum of its proper divisors (33829525529).

51155431047 is a wasteful number, since it uses less digits than its factorization.

51155431047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5172087 (or 5172084 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 36.

The spelling of 51155431047 in words is "fifty-one billion, one hundred fifty-five million, four hundred thirty-one thousand, forty-seven".