56999947 has 2 divisors, whose sum is σ = 56999948. Its totient is φ = 56999946.

The previous prime is 56999923. The next prime is 56999989. The reversal of 56999947 is 74999965.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56999947 - 2¹⁵ = 56967179 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 56999891 and 56999900.

It is not a weakly prime, because it can be changed into another prime (56999447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28499973 + 28499974.

It is an arithmetic number, because the mean of its divisors is an integer number (28499974).

Almost surely, 2^56999947 is an apocalyptic number.

56999947 is a deficient number, since it is larger than the sum of its proper divisors (1).

56999947 is an equidigital number, since it uses as much as digits as its factorization.

56999947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5511240, while the sum is 58.

The square root of 56999947 is about 7549.8309252592. The cubic root of 56999947 is about 384.8499938466.

The spelling of 56999947 in words is "fifty-six million, nine hundred ninety-nine thousand, nine hundred forty-seven".