51761931 has 16 divisors (see below), whose sum is σ = 74460960. Its totient is φ = 31795200.

The previous prime is 51761921. The next prime is 51761933. The reversal of 51761931 is 13916715.

It is a happy number.

51761931 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51761931 - 2⁹ = 51761419 is a prime.

It is a super-2 number, since 2×51761931² = 5358595001697522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51761892 and 51761901.

It is not an unprimeable number, because it can be changed into a prime (51761933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31531 + ... + 33131.

It is an arithmetic number, because the mean of its divisors is an integer number (4653810).

Almost surely, 2^51761931 is an apocalyptic number.

51761931 is a deficient number, since it is larger than the sum of its proper divisors (22699029).

51761931 is a wasteful number, since it uses less digits than its factorization.

51761931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2446.

The product of its digits is 5670, while the sum is 33.

The square root of 51761931 is about 7194.5764990026. The cubic root of 51761931 is about 372.6806318813.

The spelling of 51761931 in words is "fifty-one million, seven hundred sixty-one thousand, nine hundred thirty-one".