51658381 has 2 divisors, whose sum is σ = 51658382. Its totient is φ = 51658380.

The previous prime is 51658363. The next prime is 51658403. The reversal of 51658381 is 18385615.

51658381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50055625 + 1602756 = 7075^2 + 1266^2 .

It is a cyclic number.

It is not a de Polignac number, because 51658381 - 2⁵ = 51658349 is a prime.

It is a super-2 number, since 2×51658381² = 5337176655082322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51658381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51658301) 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 as a sum of consecutive naturals, namely, 25829190 + 25829191.

It is an arithmetic number, because the mean of its divisors is an integer number (25829191).

Almost surely, 2^51658381 is an apocalyptic number.

It is an amenable number.

51658381 is a deficient number, since it is larger than the sum of its proper divisors (1).

51658381 is an equidigital number, since it uses as much as digits as its factorization.

51658381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28800, while the sum is 37.

The square root of 51658381 is about 7187.3765032869. The cubic root of 51658381 is about 372.4319494925.

The spelling of 51658381 in words is "fifty-one million, six hundred fifty-eight thousand, three hundred eighty-one".