99658621 has 2 divisors, whose sum is σ = 99658622. Its totient is φ = 99658620.

The previous prime is 99658613. The next prime is 99658627. The reversal of 99658621 is 12685699.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62631396 + 37027225 = 7914^2 + 6085^2 .

It is a cyclic number.

It is not a de Polignac number, because 99658621 - 2³ = 99658613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99658627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49829310 + 49829311.

It is an arithmetic number, because the mean of its divisors is an integer number (49829311).

Almost surely, 2^99658621 is an apocalyptic number.

It is an amenable number.

99658621 is a deficient number, since it is larger than the sum of its proper divisors (1).

99658621 is an equidigital number, since it uses as much as digits as its factorization.

99658621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 46.

The square root of 99658621 is about 9982.9164576290. The cubic root of 99658621 is about 463.6301008684.

The spelling of 99658621 in words is "ninety-nine million, six hundred fifty-eight thousand, six hundred twenty-one".