56709139 has 2 divisors, whose sum is σ = 56709140. Its totient is φ = 56709138.

The previous prime is 56709113. The next prime is 56709151. The reversal of 56709139 is 93190765.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56709139 - 2¹⁵ = 56676371 is a prime.

It is a super-2 number, since 2×56709139² = 6431852892242642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (56709179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28354569 + 28354570.

It is an arithmetic number, because the mean of its divisors is an integer number (28354570).

Almost surely, 2^56709139 is an apocalyptic number.

56709139 is a deficient number, since it is larger than the sum of its proper divisors (1).

56709139 is an equidigital number, since it uses as much as digits as its factorization.

56709139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51030, while the sum is 40.

The square root of 56709139 is about 7530.5470584812. The cubic root of 56709139 is about 384.1943889747.

The spelling of 56709139 in words is "fifty-six million, seven hundred nine thousand, one hundred thirty-nine".