99975791 has 2 divisors, whose sum is σ = 99975792. Its totient is φ = 99975790.

The previous prime is 99975787. The next prime is 99975823. The reversal of 99975791 is 19757999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99975791 - 2² = 99975787 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99975761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49987895 + 49987896.

It is an arithmetic number, because the mean of its divisors is an integer number (49987896).

Almost surely, 2^99975791 is an apocalyptic number.

99975791 is a deficient number, since it is larger than the sum of its proper divisors (1).

99975791 is an equidigital number, since it uses as much as digits as its factorization.

99975791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1607445, while the sum is 56.

The square root of 99975791 is about 9998.7894767317. The cubic root of 99975791 is about 464.1214242636.

The spelling of 99975791 in words is "ninety-nine million, nine hundred seventy-five thousand, seven hundred ninety-one".