31613371 has 4 divisors (see below), whose sum is σ = 31641192. Its totient is φ = 31585552.

The previous prime is 31613357. The next prime is 31613377. The reversal of 31613371 is 17331613.

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

It is a cyclic number.

It is not a de Polignac number, because 31613371 - 2⁷ = 31613243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31613377) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12130 + ... + 14503.

It is an arithmetic number, because the mean of its divisors is an integer number (7910298).

Almost surely, 2^31613371 is an apocalyptic number.

31613371 is a deficient number, since it is larger than the sum of its proper divisors (27821).

31613371 is a wasteful number, since it uses less digits than its factorization.

31613371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27820.

The product of its digits is 1134, while the sum is 25.

The square root of 31613371 is about 5622.5769003189. The cubic root of 31613371 is about 316.1964109024.

Adding to 31613371 its reverse (17331613), we get a palindrome (48944984).

The spelling of 31613371 in words is "thirty-one million, six hundred thirteen thousand, three hundred seventy-one".