51431433121 has 16 divisors (see below), whose sum is σ = 53516573440. Its totient is φ = 49383509760.

The previous prime is 51431433101. The next prime is 51431433149. The reversal of 51431433121 is 12133413415.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51431433121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51431433121.

It is not an unprimeable number, because it can be changed into a prime (51431433101) 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, 9312841 + ... + 9318361.

It is an arithmetic number, because the mean of its divisors is an integer number (3344785840).

Almost surely, 2^51431433121 is an apocalyptic number.

It is an amenable number.

51431433121 is a deficient number, since it is larger than the sum of its proper divisors (2085140319).

51431433121 is a wasteful number, since it uses less digits than its factorization.

51431433121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8824.

The product of its digits is 4320, while the sum is 28.

Adding to 51431433121 its reverse (12133413415), we get a palindrome (63564846536).

The spelling of 51431433121 in words is "fifty-one billion, four hundred thirty-one million, four hundred thirty-three thousand, one hundred twenty-one".