51028456631 has 4 divisors (see below), whose sum is σ = 51032298912. Its totient is φ = 51024614352.

The previous prime is 51028456607. The next prime is 51028456639. The reversal of 51028456631 is 13665482015.

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 51028456631 - 2¹⁴ = 51028440247 is a prime.

It is a super-2 number, since 2×51028456631² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51028456639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1901150 + ... + 1927803.

It is an arithmetic number, because the mean of its divisors is an integer number (12758074728).

Almost surely, 2^51028456631 is an apocalyptic number.

51028456631 is a deficient number, since it is larger than the sum of its proper divisors (3842281).

51028456631 is a wasteful number, since it uses less digits than its factorization.

51028456631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3842280.

The product of its (nonzero) digits is 172800, while the sum is 41.

The spelling of 51028456631 in words is "fifty-one billion, twenty-eight million, four hundred fifty-six thousand, six hundred thirty-one".