99015557 has 2 divisors, whose sum is σ = 99015558. Its totient is φ = 99015556.

The previous prime is 99015509. The next prime is 99015569. The reversal of 99015557 is 75551099.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97792321 + 1223236 = 9889^2 + 1106^2 .

It is a cyclic number.

It is not a de Polignac number, because 99015557 - 2⁶ = 99015493 is a 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 (99015577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49507778 + 49507779.

It is an arithmetic number, because the mean of its divisors is an integer number (49507779).

Almost surely, 2^99015557 is an apocalyptic number.

It is an amenable number.

99015557 is a deficient number, since it is larger than the sum of its proper divisors (1).

99015557 is an equidigital number, since it uses as much as digits as its factorization.

99015557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70875, while the sum is 41.

The square root of 99015557 is about 9950.6561090212. The cubic root of 99015557 is about 462.6307311957.

The spelling of 99015557 in words is "ninety-nine million, fifteen thousand, five hundred fifty-seven".