56438381 has 2 divisors, whose sum is σ = 56438382. Its totient is φ = 56438380.

The previous prime is 56438353. The next prime is 56438387. The reversal of 56438381 is 18383465.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55741156 + 697225 = 7466^2 + 835^2 .

It is a cyclic number.

It is not a de Polignac number, because 56438381 - 2¹⁰ = 56437357 is a prime.

It is a super-2 number, since 2×56438381² = 6370581699802322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56438387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28219190 + 28219191.

It is an arithmetic number, because the mean of its divisors is an integer number (28219191).

Almost surely, 2^56438381 is an apocalyptic number.

It is an amenable number.

56438381 is a deficient number, since it is larger than the sum of its proper divisors (1).

56438381 is an equidigital number, since it uses as much as digits as its factorization.

56438381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 38.

The square root of 56438381 is about 7512.5482361180. The cubic root of 56438381 is about 383.5819674109.

The spelling of 56438381 in words is "fifty-six million, four hundred thirty-eight thousand, three hundred eighty-one".