56671709 has 2 divisors, whose sum is σ = 56671710. Its totient is φ = 56671708.

The previous prime is 56671697. The next prime is 56671739. The reversal of 56671709 is 90717665.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41964484 + 14707225 = 6478^2 + 3835^2 .

It is a cyclic number.

It is not a de Polignac number, because 56671709 - 2⁸ = 56671453 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56671739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28335854 + 28335855.

It is an arithmetic number, because the mean of its divisors is an integer number (28335855).

Almost surely, 2^56671709 is an apocalyptic number.

It is an amenable number.

56671709 is a deficient number, since it is larger than the sum of its proper divisors (1).

56671709 is an equidigital number, since it uses as much as digits as its factorization.

56671709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 79380, while the sum is 41.

The square root of 56671709 is about 7528.0614370500. The cubic root of 56671709 is about 384.1098431604.

The spelling of 56671709 in words is "fifty-six million, six hundred seventy-one thousand, seven hundred nine".