51246631 has 4 divisors (see below), whose sum is σ = 51620832. Its totient is φ = 50872432.

The previous prime is 51246617. The next prime is 51246641. The reversal of 51246631 is 13664215.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13664215 = 5 ⋅2732843.

It is a cyclic number.

It is not a de Polignac number, because 51246631 - 2⁹ = 51246119 is a prime.

It is a super-2 number, since 2×51246631² = 5252434377700322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51246631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51246641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 186895 + ... + 187168.

It is an arithmetic number, because the mean of its divisors is an integer number (12905208).

Almost surely, 2^51246631 is an apocalyptic number.

51246631 is a deficient number, since it is larger than the sum of its proper divisors (374201).

51246631 is a wasteful number, since it uses less digits than its factorization.

51246631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374200.

The product of its digits is 4320, while the sum is 28.

The square root of 51246631 is about 7158.6752266044. The cubic root of 51246631 is about 371.4398026542.

The spelling of 51246631 in words is "fifty-one million, two hundred forty-six thousand, six hundred thirty-one".