51932781 has 24 divisors (see below), whose sum is σ = 80810496. Its totient is φ = 32044320.

The previous prime is 51932753. The next prime is 51932801. The reversal of 51932781 is 18723915.

It is not a de Polignac number, because 51932781 - 2⁶ = 51932717 is a prime.

It is a super-2 number, since 2×51932781² = 5394027484787922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51932731) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2371 + ... + 10463.

It is an arithmetic number, because the mean of its divisors is an integer number (3367104).

Almost surely, 2^51932781 is an apocalyptic number.

It is an amenable number.

51932781 is a deficient number, since it is larger than the sum of its proper divisors (28877715).

51932781 is a wasteful number, since it uses less digits than its factorization.

51932781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8153 (or 8150 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 51932781 is about 7206.4402446700. The cubic root of 51932781 is about 373.0902157754.

The spelling of 51932781 in words is "fifty-one million, nine hundred thirty-two thousand, seven hundred eighty-one".