99975427 has 2 divisors, whose sum is σ = 99975428. Its totient is φ = 99975426.

The previous prime is 99975413. The next prime is 99975451. The reversal of 99975427 is 72457999.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99975427 is a prime.

It is not a weakly prime, because it can be changed into another prime (99975467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49987713 + 49987714.

It is an arithmetic number, because the mean of its divisors is an integer number (49987714).

Almost surely, 2^99975427 is an apocalyptic number.

99975427 is a deficient number, since it is larger than the sum of its proper divisors (1).

99975427 is an equidigital number, since it uses as much as digits as its factorization.

99975427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1428840, while the sum is 52.

The square root of 99975427 is about 9998.7712745117. The cubic root of 99975427 is about 464.1208609926.

The spelling of 99975427 in words is "ninety-nine million, nine hundred seventy-five thousand, four hundred twenty-seven".