31310121 has 8 divisors (see below), whose sum is σ = 42534720. Its totient is φ = 20479472.

The previous prime is 31310089. The next prime is 31310137. The reversal of 31310121 is 12101313.

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 31310121 - 2⁵ = 31310089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31310097 and 31310106.

It is not an unprimeable number, because it can be changed into a prime (31310161) 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 7 ways as a sum of consecutive naturals, for example, 98301 + ... + 98618.

It is an arithmetic number, because the mean of its divisors is an integer number (5316840).

Almost surely, 2^31310121 is an apocalyptic number.

It is an amenable number.

31310121 is a deficient number, since it is larger than the sum of its proper divisors (11224599).

31310121 is a wasteful number, since it uses less digits than its factorization.

31310121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196975.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 31310121 is about 5595.5447455989. The cubic root of 31310121 is about 315.1821269777.

Adding to 31310121 its reverse (12101313), we get a palindrome (43411434).

The spelling of 31310121 in words is "thirty-one million, three hundred ten thousand, one hundred twenty-one".