51447631 has 8 divisors (see below), whose sum is σ = 53190144. Its totient is φ = 49710360.

The previous prime is 51447629. The next prime is 51447647. The reversal of 51447631 is 13674415.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51447631 - 2¹ = 51447629 is a prime.

It is a super-2 number, since 2×51447631² = 5293717471024322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51447593 and 51447602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51457631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35340 + ... + 36766.

It is an arithmetic number, because the mean of its divisors is an integer number (6648768).

Almost surely, 2^51447631 is an apocalyptic number.

51447631 is a deficient number, since it is larger than the sum of its proper divisors (1742513).

51447631 is a wasteful number, since it uses less digits than its factorization.

51447631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2621.

The product of its digits is 10080, while the sum is 31.

The square root of 51447631 is about 7172.7003980370. The cubic root of 51447631 is about 371.9247906498.

The spelling of 51447631 in words is "fifty-one million, four hundred forty-seven thousand, six hundred thirty-one".