31000099 has 4 divisors (see below), whose sum is σ = 33384736. Its totient is φ = 28615464.

The previous prime is 31000087. The next prime is 31000127. The reversal of 31000099 is 99000013.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31000099 is a prime.

It is a super-2 number, since 2×31000099² = 1922012276019602, which contains 22 as substring.

It is a Duffinian number.

31000099 is a modest number, since divided by 99 gives 31 as remainder.

It is not an unprimeable number, because it can be changed into a prime (31000199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1192299 + ... + 1192324.

It is an arithmetic number, because the mean of its divisors is an integer number (8346184).

Almost surely, 2^31000099 is an apocalyptic number.

31000099 is a deficient number, since it is larger than the sum of its proper divisors (2384637).

31000099 is a wasteful number, since it uses less digits than its factorization.

31000099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2384636.

The product of its (nonzero) digits is 243, while the sum is 22.

The square root of 31000099 is about 5567.7732532854. The cubic root of 31000099 is about 314.1383996438.

The spelling of 31000099 in words is "thirty-one million, ninety-nine", and thus it is an aban number and an uban number.