51749631 has 8 divisors (see below), whose sum is σ = 76666160. Its totient is φ = 34499736.

The previous prime is 51749623. The next prime is 51749651. The reversal of 51749631 is 13694715.

51749631 is a `hidden beast` number, since 5 + 17 + 4 + 9 + 631 = 666.

It is not a de Polignac number, because 51749631 - 2³ = 51749623 is a prime.

It is a super-2 number, since 2×51749631² = 5356048617272322, which 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 (51749611) 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, 958300 + ... + 958353.

It is an arithmetic number, because the mean of its divisors is an integer number (9583270).

Almost surely, 2^51749631 is an apocalyptic number.

51749631 is a deficient number, since it is larger than the sum of its proper divisors (24916529).

51749631 is a wasteful number, since it uses less digits than its factorization.

51749631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1916662 (or 1916656 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 51749631 is about 7193.7216376504. The cubic root of 51749631 is about 372.6511099604.

The spelling of 51749631 in words is "fifty-one million, seven hundred forty-nine thousand, six hundred thirty-one".