99212569 has 2 divisors, whose sum is σ = 99212570. Its totient is φ = 99212568.

The previous prime is 99212557. The next prime is 99212599. The reversal of 99212569 is 96521299.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51768025 + 47444544 = 7195^2 + 6888^2 .

It is a cyclic number.

It is not a de Polignac number, because 99212569 - 2²³ = 90823961 is a prime.

It is a super-2 number, since 2×99212569² = 19686267695159522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (99212599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49606284 + 49606285.

It is an arithmetic number, because the mean of its divisors is an integer number (49606285).

Almost surely, 2^99212569 is an apocalyptic number.

It is an amenable number.

99212569 is a deficient number, since it is larger than the sum of its proper divisors (1).

99212569 is an equidigital number, since it uses as much as digits as its factorization.

99212569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 87480, while the sum is 43.

The square root of 99212569 is about 9960.5506373895. The cubic root of 99212569 is about 462.9373612017.

The spelling of 99212569 in words is "ninety-nine million, two hundred twelve thousand, five hundred sixty-nine".