99931399 has 4 divisors (see below), whose sum is σ = 100002760. Its totient is φ = 99860040.

The previous prime is 99931331. The next prime is 99931411. The reversal of 99931399 is 99313999.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 99931399 - 2¹³ = 99923207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99931099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33537 + ... + 36394.

It is an arithmetic number, because the mean of its divisors is an integer number (25000690).

Almost surely, 2^99931399 is an apocalyptic number.

99931399 is a deficient number, since it is larger than the sum of its proper divisors (71361).

99931399 is a wasteful number, since it uses less digits than its factorization.

99931399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71360.

The product of its digits is 531441, while the sum is 52.

The square root of 99931399 is about 9996.5693615360. The cubic root of 99931399 is about 464.0527198693.

The spelling of 99931399 in words is "ninety-nine million, nine hundred thirty-one thousand, three hundred ninety-nine".