31113605 has 8 divisors (see below), whose sum is σ = 37366272. Its totient is φ = 24870928.

The previous prime is 31113581. The next prime is 31113611. The reversal of 31113605 is 50631113.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 31113605 - 2⁶ = 31113541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10964 + ... + 13506.

It is an arithmetic number, because the mean of its divisors is an integer number (4670784).

Almost surely, 2^31113605 is an apocalyptic number.

It is an amenable number.

31113605 is a deficient number, since it is larger than the sum of its proper divisors (6252667).

31113605 is a wasteful number, since it uses less digits than its factorization.

31113605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4995.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 31113605 is about 5577.9570632984. The cubic root of 31113605 is about 314.5213356570.

Adding to 31113605 its reverse (50631113), we get a palindrome (81744718).

The spelling of 31113605 in words is "thirty-one million, one hundred thirteen thousand, six hundred five".