99621091 has 2 divisors, whose sum is σ = 99621092. Its totient is φ = 99621090.

The previous prime is 99621083. The next prime is 99621097. The reversal of 99621091 is 19012699.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99621091 - 2³ = 99621083 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99621091.

It is not a weakly prime, because it can be changed into another prime (99621097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49810545 + 49810546.

It is an arithmetic number, because the mean of its divisors is an integer number (49810546).

Almost surely, 2^99621091 is an apocalyptic number.

99621091 is a deficient number, since it is larger than the sum of its proper divisors (1).

99621091 is an equidigital number, since it uses as much as digits as its factorization.

99621091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 37.

The square root of 99621091 is about 9981.0365694150. The cubic root of 99621091 is about 463.5718947572.

The spelling of 99621091 in words is "ninety-nine million, six hundred twenty-one thousand, ninety-one".