56199991 has 2 divisors, whose sum is σ = 56199992. Its totient is φ = 56199990.

The previous prime is 56199973. The next prime is 56200013. The reversal of 56199991 is 19999165.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56199991 - 2¹¹ = 56197943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56199911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28099995 + 28099996.

It is an arithmetic number, because the mean of its divisors is an integer number (28099996).

Almost surely, 2^56199991 is an apocalyptic number.

56199991 is a deficient number, since it is larger than the sum of its proper divisors (1).

56199991 is an equidigital number, since it uses as much as digits as its factorization.

56199991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 196830, while the sum is 49.

The square root of 56199991 is about 7496.6653253297. The cubic root of 56199991 is about 383.0411347721.

The spelling of 56199991 in words is "fifty-six million, one hundred ninety-nine thousand, nine hundred ninety-one".