31099842 has 16 divisors (see below), whose sum is σ = 69110880. Its totient is φ = 10366596.

The previous prime is 31099829. The next prime is 31099867. The reversal of 31099842 is 24899013.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 31099797 and 31099806.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 287908 + ... + 288015.

It is an arithmetic number, because the mean of its divisors is an integer number (4319430).

Almost surely, 2^31099842 is an apocalyptic number.

31099842 is an abundant number, since it is smaller than the sum of its proper divisors (38011038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31099842 is a wasteful number, since it uses less digits than its factorization.

31099842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 575934 (or 575928 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 31099842 is about 5576.7232314326. The cubic root of 31099842 is about 314.4749529939.

The spelling of 31099842 in words is "thirty-one million, ninety-nine thousand, eight hundred forty-two".