51631643 has 6 divisors (see below), whose sum is σ = 60061356. Its totient is φ = 44255652.

The previous prime is 51631637. The next prime is 51631649. The reversal of 51631643 is 34613615.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51631637) and next prime (51631649).

It is not a de Polignac number, because 51631643 - 2⁴ = 51631627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51631649) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 526805 + ... + 526902.

It is an arithmetic number, because the mean of its divisors is an integer number (10010226).

Almost surely, 2^51631643 is an apocalyptic number.

51631643 is a deficient number, since it is larger than the sum of its proper divisors (8429713).

51631643 is a wasteful number, since it uses less digits than its factorization.

51631643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053721 (or 1053714 counting only the distinct ones).

The product of its digits is 6480, while the sum is 29.

The square root of 51631643 is about 7185.5161957928. The cubic root of 51631643 is about 372.3676823859.

The spelling of 51631643 in words is "fifty-one million, six hundred thirty-one thousand, six hundred forty-three".