31109313 has 16 divisors (see below), whose sum is σ = 42428736. Its totient is φ = 20270400.

The previous prime is 31109297. The next prime is 31109321. The reversal of 31109313 is 31390113.

It is not a de Polignac number, because 31109313 - 2⁴ = 31109297 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31109313.

It is not an unprimeable number, because it can be changed into a prime (31109333) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24531 + ... + 25767.

It is an arithmetic number, because the mean of its divisors is an integer number (2651796).

Almost surely, 2^31109313 is an apocalyptic number.

It is an amenable number.

31109313 is a deficient number, since it is larger than the sum of its proper divisors (11319423).

31109313 is a wasteful number, since it uses less digits than its factorization.

31109313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1424.

The product of its (nonzero) digits is 243, while the sum is 21.

The square root of 31109313 is about 5577.5723213599. The cubic root of 31109313 is about 314.5068726630.

Adding to 31109313 its reverse (31390113), we get a palindrome (62499426).

The spelling of 31109313 in words is "thirty-one million, one hundred nine thousand, three hundred thirteen".