31109418 has 24 divisors (see below), whose sum is σ = 67731456. Its totient is φ = 10319400.

The previous prime is 31109411. The next prime is 31109437. The reversal of 31109418 is 81490113.

It is a junction number, because it is equal to n+sod(n) for n = 31109391 and 31109400.

It is not an unprimeable number, because it can be changed into a prime (31109411) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 298 + ... + 7893.

It is an arithmetic number, because the mean of its divisors is an integer number (2822144).

Almost surely, 2^31109418 is an apocalyptic number.

31109418 is an abundant number, since it is smaller than the sum of its proper divisors (36622038).

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

31109418 is a wasteful number, since it uses less digits than its factorization.

31109418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8410 (or 8407 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 31109418 is about 5577.5817340493. The cubic root of 31109418 is about 314.5072265032.

The spelling of 31109418 in words is "thirty-one million, one hundred nine thousand, four hundred eighteen".