56172839 has 2 divisors, whose sum is σ = 56172840. Its totient is φ = 56172838.

The previous prime is 56172827. The next prime is 56172841. The reversal of 56172839 is 93827165.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56172839 - 2¹² = 56168743 is a prime.

Together with 56172841, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 56172796 and 56172805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56172859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28086419 + 28086420.

It is an arithmetic number, because the mean of its divisors is an integer number (28086420).

Almost surely, 2^56172839 is an apocalyptic number.

56172839 is a deficient number, since it is larger than the sum of its proper divisors (1).

56172839 is an equidigital number, since it uses as much as digits as its factorization.

56172839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 41.

The square root of 56172839 is about 7494.8541680276. The cubic root of 56172839 is about 382.9794383906.

The spelling of 56172839 in words is "fifty-six million, one hundred seventy-two thousand, eight hundred thirty-nine".