99731919 has 8 divisors (see below), whose sum is σ = 151972480. Its totient is φ = 56989656.

The previous prime is 99731903. The next prime is 99731939. The reversal of 99731919 is 91913799.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 99731919 - 2⁴ = 99731903 is a prime.

It is a super-3 number, since 3×99731919³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99731939) 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 7 ways as a sum of consecutive naturals, for example, 2374549 + ... + 2374590.

It is an arithmetic number, because the mean of its divisors is an integer number (18996560).

Almost surely, 2^99731919 is an apocalyptic number.

99731919 is a deficient number, since it is larger than the sum of its proper divisors (52240561).

99731919 is a wasteful number, since it uses less digits than its factorization.

99731919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4749149.

The product of its digits is 137781, while the sum is 48.

The square root of 99731919 is about 9986.5869545105. The cubic root of 99731919 is about 463.7437382395.

The spelling of 99731919 in words is "ninety-nine million, seven hundred thirty-one thousand, nine hundred nineteen".