99561607 has 2 divisors, whose sum is σ = 99561608. Its totient is φ = 99561606.

The previous prime is 99561589. The next prime is 99561617. The reversal of 99561607 is 70616599.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99561607 - 2¹⁵ = 99528839 is a prime.

It is equal to p_5737597 and since 99561607 and 5737597 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99561617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49780803 + 49780804.

It is an arithmetic number, because the mean of its divisors is an integer number (49780804).

Almost surely, 2^99561607 is an apocalyptic number.

99561607 is a deficient number, since it is larger than the sum of its proper divisors (1).

99561607 is an equidigital number, since it uses as much as digits as its factorization.

99561607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 102060, while the sum is 43.

The square root of 99561607 is about 9978.0562736437. The cubic root of 99561607 is about 463.4796097450.

The spelling of 99561607 in words is "ninety-nine million, five hundred sixty-one thousand, six hundred seven".