51988831 has 2 divisors, whose sum is σ = 51988832. Its totient is φ = 51988830.

The previous prime is 51988819. The next prime is 51988837. The reversal of 51988831 is 13888915.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51988831 - 2⁹ = 51988319 is a prime.

It is a super-2 number, since 2×51988831² = 5405677097493122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51988837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25994415 + 25994416.

It is an arithmetic number, because the mean of its divisors is an integer number (25994416).

Almost surely, 2^51988831 is an apocalyptic number.

51988831 is a deficient number, since it is larger than the sum of its proper divisors (1).

51988831 is an equidigital number, since it uses as much as digits as its factorization.

51988831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 43.

The square root of 51988831 is about 7210.3280785274. The cubic root of 51988831 is about 373.2243904239.

The spelling of 51988831 in words is "fifty-one million, nine hundred eighty-eight thousand, eight hundred thirty-one".