51215195431 has 8 divisors (see below), whose sum is σ = 51412113728. Its totient is φ = 51018336000.

The previous prime is 51215195429. The next prime is 51215195441. The reversal of 51215195431 is 13459151215.

51215195431 = T₁₈₄₇₇₈ + T₁₈₄₇₇₉ + T₁₈₄₇₈₀.

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

It is a 8-Lehmer number, since φ(51215195431) divides (51215195431-1)⁸.

It is a cyclic number.

It is not a de Polignac number, because 51215195431 - 2¹ = 51215195429 is a prime.

It is a super-2 number, since 2×51215195431² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51215195441) 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, 2624671 + ... + 2644111.

It is an arithmetic number, because the mean of its divisors is an integer number (6426514216).

Almost surely, 2^51215195431 is an apocalyptic number.

51215195431 is the 184780-th centered triangular number.

51215195431 is a deficient number, since it is larger than the sum of its proper divisors (196918297).

51215195431 is a wasteful number, since it uses less digits than its factorization.

51215195431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29433.

The product of its digits is 27000, while the sum is 37.

The spelling of 51215195431 in words is "fifty-one billion, two hundred fifteen million, one hundred ninety-five thousand, four hundred thirty-one".