51201002531 has 6 divisors (see below), whose sum is σ = 59560349940. Its totient is φ = 43886573556.

The previous prime is 51201002497. The next prime is 51201002591. The reversal of 51201002531 is 13520010215.

It is a happy number.

It is not a de Polignac number, because 51201002531 - 2⁶ = 51201002467 is a prime.

It is a super-2 number, since 2×51201002531² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51201002591) 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 in 5 ways as a sum of consecutive naturals, for example, 522459161 + ... + 522459258.

It is an arithmetic number, because the mean of its divisors is an integer number (9926724990).

Almost surely, 2^51201002531 is an apocalyptic number.

51201002531 is a deficient number, since it is larger than the sum of its proper divisors (8359347409).

51201002531 is a wasteful number, since it uses less digits than its factorization.

51201002531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044918433 (or 1044918426 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

Adding to 51201002531 its reverse (13520010215), we get a palindrome (64721012746).

The spelling of 51201002531 in words is "fifty-one billion, two hundred one million, two thousand, five hundred thirty-one".