31316621 has 8 divisors (see below), whose sum is σ = 35830080. Its totient is φ = 26813088.

The previous prime is 31316581. The next prime is 31316629. The reversal of 31316621 is 12661313.

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 31316621 - 2⁶ = 31316557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31316629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6425 + ... + 10193.

It is an arithmetic number, because the mean of its divisors is an integer number (4478760).

Almost surely, 2^31316621 is an apocalyptic number.

It is an amenable number.

31316621 is a deficient number, since it is larger than the sum of its proper divisors (4513459).

31316621 is a wasteful number, since it uses less digits than its factorization.

31316621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4963.

The product of its digits is 648, while the sum is 23.

The square root of 31316621 is about 5596.1255346892. The cubic root of 31316621 is about 315.2039361351.

Adding to 31316621 its reverse (12661313), we get a palindrome (43977934).

The spelling of 31316621 in words is "thirty-one million, three hundred sixteen thousand, six hundred twenty-one".