56862781 has 2 divisors, whose sum is σ = 56862782. Its totient is φ = 56862780.

The previous prime is 56862769. The next prime is 56862787. The reversal of 56862781 is 18726865.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47196900 + 9665881 = 6870^2 + 3109^2 .

It is a cyclic number.

It is not a de Polignac number, because 56862781 - 2⁵ = 56862749 is a prime.

It is a super-2 number, since 2×56862781² = 6466751726107922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56862787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28431390 + 28431391.

It is an arithmetic number, because the mean of its divisors is an integer number (28431391).

Almost surely, 2^56862781 is an apocalyptic number.

It is an amenable number.

56862781 is a deficient number, since it is larger than the sum of its proper divisors (1).

56862781 is an equidigital number, since it uses as much as digits as its factorization.

56862781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 43.

The square root of 56862781 is about 7540.7414091719. The cubic root of 56862781 is about 384.5410418947.

The spelling of 56862781 in words is "fifty-six million, eight hundred sixty-two thousand, seven hundred eighty-one".