99941391 has 16 divisors (see below), whose sum is σ = 161521920. Its totient is φ = 60570360.

The previous prime is 99941321. The next prime is 99941447. The reversal of 99941391 is 19314999.

It is not a de Polignac number, because 99941391 - 2⁷ = 99941263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99941321) 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 in 15 ways as a sum of consecutive naturals, for example, 167955 + ... + 168548.

It is an arithmetic number, because the mean of its divisors is an integer number (10095120).

Almost surely, 2^99941391 is an apocalyptic number.

99941391 is a deficient number, since it is larger than the sum of its proper divisors (61580529).

99941391 is a wasteful number, since it uses less digits than its factorization.

99941391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336523 (or 336517 counting only the distinct ones).

The product of its digits is 78732, while the sum is 45.

The square root of 99941391 is about 9997.0691204973. The cubic root of 99941391 is about 464.0681860134.

The spelling of 99941391 in words is "ninety-nine million, nine hundred forty-one thousand, three hundred ninety-one".