99731939 has 2 divisors, whose sum is σ = 99731940. Its totient is φ = 99731938.

The previous prime is 99731903. The next prime is 99731941. The reversal of 99731939 is 93913799.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99731939 - 2¹⁶ = 99666403 is a prime.

Together with 99731941, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99731959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49865969 + 49865970.

It is an arithmetic number, because the mean of its divisors is an integer number (49865970).

Almost surely, 2^99731939 is an apocalyptic number.

99731939 is a deficient number, since it is larger than the sum of its proper divisors (1).

99731939 is an equidigital number, since it uses as much as digits as its factorization.

99731939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 413343, while the sum is 50.

The square root of 99731939 is about 9986.5879558536. The cubic root of 99731939 is about 463.7437692389.

The spelling of 99731939 in words is "ninety-nine million, seven hundred thirty-one thousand, nine hundred thirty-nine".