99564551 has 2 divisors, whose sum is σ = 99564552. Its totient is φ = 99564550.

The previous prime is 99564547. The next prime is 99564557. The reversal of 99564551 is 15546599.

It is a weak prime.

It is an emirp because it is prime and its reverse (15546599) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99564551 - 2² = 99564547 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 (99564557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49782275 + 49782276.

It is an arithmetic number, because the mean of its divisors is an integer number (49782276).

Almost surely, 2^99564551 is an apocalyptic number.

99564551 is a deficient number, since it is larger than the sum of its proper divisors (1).

99564551 is an equidigital number, since it uses as much as digits as its factorization.

99564551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 243000, while the sum is 44.

The square root of 99564551 is about 9978.2037962752. The cubic root of 99564551 is about 463.4841780070.

The spelling of 99564551 in words is "ninety-nine million, five hundred sixty-four thousand, five hundred fifty-one".