51431021553 has 8 divisors (see below), whose sum is σ = 72608501088. Its totient is φ = 32270444864.

The previous prime is 51431021507. The next prime is 51431021581. The reversal of 51431021553 is 35512013415.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51431021553 - 2²¹ = 51428924401 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51431021553.

It is not an unprimeable number, because it can be changed into a prime (51431025553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 504225651 + ... + 504225752.

It is an arithmetic number, because the mean of its divisors is an integer number (9076062636).

Almost surely, 2^51431021553 is an apocalyptic number.

It is an amenable number.

51431021553 is a deficient number, since it is larger than the sum of its proper divisors (21177479535).

51431021553 is a wasteful number, since it uses less digits than its factorization.

51431021553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008451423.

The product of its (nonzero) digits is 9000, while the sum is 30.

Adding to 51431021553 its reverse (35512013415), we get a palindrome (86943034968).

The spelling of 51431021553 in words is "fifty-one billion, four hundred thirty-one million, twenty-one thousand, five hundred fifty-three".