51351512431 has 4 divisors (see below), whose sum is σ = 53008012864. Its totient is φ = 49695012000.

The previous prime is 51351512413. The next prime is 51351512447. The reversal of 51351512431 is 13421515315.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51351512431 - 2⁹ = 51351511919 is a prime.

It is a super-2 number, since 2×51351512431² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 1656500401 = 51351512431 / (5 + 1 + 3 + 5 + 1 + 5 + 1 + 2 + 4 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51351512393 and 51351512402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51351512731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 828250170 + ... + 828250231.

It is an arithmetic number, because the mean of its divisors is an integer number (13252003216).

Almost surely, 2^51351512431 is an apocalyptic number.

51351512431 is a deficient number, since it is larger than the sum of its proper divisors (1656500433).

51351512431 is a wasteful number, since it uses less digits than its factorization.

51351512431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1656500432.

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

The spelling of 51351512431 in words is "fifty-one billion, three hundred fifty-one million, five hundred twelve thousand, four hundred thirty-one".