51100631 has 2 divisors, whose sum is σ = 51100632. Its totient is φ = 51100630.

The previous prime is 51100619. The next prime is 51100661. The reversal of 51100631 is 13600115.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51100631 - 2¹⁴ = 51084247 is a prime.

It is a super-2 number, since 2×51100631² = 5222548977196322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51100601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25550315 + 25550316.

It is an arithmetic number, because the mean of its divisors is an integer number (25550316).

Almost surely, 2^51100631 is an apocalyptic number.

51100631 is a deficient number, since it is larger than the sum of its proper divisors (1).

51100631 is an equidigital number, since it uses as much as digits as its factorization.

51100631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 51100631 is about 7148.4705357160. The cubic root of 51100631 is about 371.0867271327.

Adding to 51100631 its reverse (13600115), we get a palindrome (64700746).

The spelling of 51100631 in words is "fifty-one million, one hundred thousand, six hundred thirty-one".