56149991 has 2 divisors, whose sum is σ = 56149992. Its totient is φ = 56149990.

The previous prime is 56149937. The next prime is 56150047. The reversal of 56149991 is 19994165.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56149991 is a prime.

It is a super-3 number, since 3×56149991³ (a number of 24 digits) contains 333 as substring.

It is a Sophie Germain 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 (56149901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28074995 + 28074996.

It is an arithmetic number, because the mean of its divisors is an integer number (28074996).

Almost surely, 2^56149991 is an apocalyptic number.

56149991 is a deficient number, since it is larger than the sum of its proper divisors (1).

56149991 is an equidigital number, since it uses as much as digits as its factorization.

56149991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 87480, while the sum is 44.

The square root of 56149991 is about 7493.3297671996. The cubic root of 56149991 is about 382.9275064070.

The spelling of 56149991 in words is "fifty-six million, one hundred forty-nine thousand, nine hundred ninety-one".