56778431 has 2 divisors, whose sum is σ = 56778432. Its totient is φ = 56778430.

The previous prime is 56778409. The next prime is 56778437. The reversal of 56778431 is 13487765.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56778431 - 2⁶ = 56778367 is a prime.

It is a super-2 number, since 2×56778431² = 6447580453643522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56778437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28389215 + 28389216.

It is an arithmetic number, because the mean of its divisors is an integer number (28389216).

Almost surely, 2^56778431 is an apocalyptic number.

56778431 is a deficient number, since it is larger than the sum of its proper divisors (1).

56778431 is an equidigital number, since it uses as much as digits as its factorization.

56778431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141120, while the sum is 41.

The square root of 56778431 is about 7535.1463821216. The cubic root of 56778431 is about 384.3508056334.

The spelling of 56778431 in words is "fifty-six million, seven hundred seventy-eight thousand, four hundred thirty-one".