99309490391 has 2 divisors, whose sum is σ = 99309490392. Its totient is φ = 99309490390.

The previous prime is 99309490387. The next prime is 99309490409. The reversal of 99309490391 is 19309490399.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99309490391 - 2² = 99309490387 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99309490361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49654745195 + 49654745196.

It is an arithmetic number, because the mean of its divisors is an integer number (49654745196).

Almost surely, 2^99309490391 is an apocalyptic number.

99309490391 is a deficient number, since it is larger than the sum of its proper divisors (1).

99309490391 is an equidigital number, since it uses as much as digits as its factorization.

99309490391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2125764, while the sum is 56.

The spelling of 99309490391 in words is "ninety-nine billion, three hundred nine million, four hundred ninety thousand, three hundred ninety-one".