51431213551 has 16 divisors (see below), whose sum is σ = 55303140096. Its totient is φ = 47654234496.

The previous prime is 51431213539. The next prime is 51431213557. The reversal of 51431213551 is 15531213415.

It is a cyclic number.

It is not a de Polignac number, because 51431213551 - 2²¹ = 51429116399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51431213557) 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, 1976910 + ... + 2002756.

It is an arithmetic number, because the mean of its divisors is an integer number (3456446256).

Almost surely, 2^51431213551 is an apocalyptic number.

51431213551 is a deficient number, since it is larger than the sum of its proper divisors (3871926545).

51431213551 is a wasteful number, since it uses less digits than its factorization.

51431213551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27678.

The product of its digits is 9000, while the sum is 31.

Adding to 51431213551 its reverse (15531213415), we get a palindrome (66962426966).

The spelling of 51431213551 in words is "fifty-one billion, four hundred thirty-one million, two hundred thirteen thousand, five hundred fifty-one".