51131131401 has 16 divisors (see below), whose sum is σ = 82014848000. Its totient is φ = 27680010768.

The previous prime is 51131131391. The next prime is 51131131453. The reversal of 51131131401 is 10413113115.

It is not a de Polignac number, because 51131131401 - 2¹³ = 51131123209 is a prime.

It is a super-2 number, since 2×51131131401² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51131132401) 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 15 ways as a sum of consecutive naturals, for example, 64073701 + ... + 64074498.

It is an arithmetic number, because the mean of its divisors is an integer number (5125928000).

Almost surely, 2^51131131401 is an apocalyptic number.

It is an amenable number.

51131131401 is a deficient number, since it is larger than the sum of its proper divisors (30883716599).

51131131401 is a wasteful number, since it uses less digits than its factorization.

51131131401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128148228.

The product of its (nonzero) digits is 180, while the sum is 21.

Adding to 51131131401 its reverse (10413113115), we get a palindrome (61544244516).

The spelling of 51131131401 in words is "fifty-one billion, one hundred thirty-one million, one hundred thirty-one thousand, four hundred one".