999091031 has 8 divisors (see below), whose sum is σ = 1006126800. Its totient is φ = 992080512.

The previous prime is 999091021. The next prime is 999091063. The reversal of 999091031 is 130190999.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999091031 is a prime.

It is a super-2 number, since 2×999091031² = 1996365776449285922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 999091031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999091021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76895 + ... + 88943.

It is an arithmetic number, because the mean of its divisors is an integer number (125765850).

Almost surely, 2^999091031 is an apocalyptic number.

999091031 is a deficient number, since it is larger than the sum of its proper divisors (7035769).

999091031 is a wasteful number, since it uses less digits than its factorization.

999091031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12625.

The product of its (nonzero) digits is 19683, while the sum is 41.

The square root of 999091031 is about 31608.4012724465. The cubic root of 999091031 is about 999.6969184842.

The spelling of 999091031 in words is "nine hundred ninety-nine million, ninety-one thousand, thirty-one".