99890031 has 8 divisors (see below), whose sum is σ = 133462144. Its totient is φ = 66455640.

The previous prime is 99890017. The next prime is 99890033. The reversal of 99890031 is 13009899.

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

It is not a de Polignac number, because 99890031 - 2¹⁷ = 99758959 is a prime.

It is a super-2 number, since 2×99890031² = 19956036586361922, which contains 22 as substring.

It is the 9995-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99890033) by changing a digit.

It is a nontrivial repunit in base 9994.

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, 32725 + ... + 35646.

It is an arithmetic number, because the mean of its divisors is an integer number (16682768).

Almost surely, 2^99890031 is an apocalyptic number.

99890031 is a deficient number, since it is larger than the sum of its proper divisors (33572113).

99890031 is a wasteful number, since it uses less digits than its factorization.

99890031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68861.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 99890031 is about 9994.5000375206. The cubic root of 99890031 is about 463.9886773273.

The spelling of 99890031 in words is "ninety-nine million, eight hundred ninety thousand, thirty-one".