51131449975 has 12 divisors (see below), whose sum is σ = 63424445040. Its totient is φ = 40891323200.

The previous prime is 51131449973. The next prime is 51131449981. The reversal of 51131449975 is 57994413115.

It is not a de Polignac number, because 51131449975 - 2¹ = 51131449973 is a prime.

It is a super-2 number, since 2×51131449975² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51131449973) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 270211 + ... + 418660.

It is an arithmetic number, because the mean of its divisors is an integer number (5285370420).

Almost surely, 2^51131449975 is an apocalyptic number.

51131449975 is a deficient number, since it is larger than the sum of its proper divisors (12292995065).

51131449975 is a wasteful number, since it uses less digits than its factorization.

51131449975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691850 (or 691845 counting only the distinct ones).

The product of its digits is 680400, while the sum is 49.

The spelling of 51131449975 in words is "fifty-one billion, one hundred thirty-one million, four hundred forty-nine thousand, nine hundred seventy-five".