56174021381 has 2 divisors, whose sum is σ = 56174021382. Its totient is φ = 56174021380.

The previous prime is 56174021369. The next prime is 56174021399. The reversal of 56174021381 is 18312047165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56145302500 + 28718881 = 236950^2 + 5359^2 .

It is a cyclic number.

It is not a de Polignac number, because 56174021381 - 2⁶ = 56174021317 is a prime.

It is a super-2 number, since 2×56174021381² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56174021681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28087010690 + 28087010691.

It is an arithmetic number, because the mean of its divisors is an integer number (28087010691).

Almost surely, 2^56174021381 is an apocalyptic number.

It is an amenable number.

56174021381 is a deficient number, since it is larger than the sum of its proper divisors (1).

56174021381 is an equidigital number, since it uses as much as digits as its factorization.

56174021381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 38.

The spelling of 56174021381 in words is "fifty-six billion, one hundred seventy-four million, twenty-one thousand, three hundred eighty-one".