31330121 has 8 divisors (see below), whose sum is σ = 32961600. Its totient is φ = 29735440.

The previous prime is 31330111. The next prime is 31330129. The reversal of 31330121 is 12103313.

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

It is not a de Polignac number, because 31330121 - 2²² = 27135817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31330096 and 31330105.

It is not an unprimeable number, because it can be changed into a prime (31330129) 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, 7445 + ... + 10866.

It is an arithmetic number, because the mean of its divisors is an integer number (4120200).

Almost surely, 2^31330121 is an apocalyptic number.

It is an amenable number.

31330121 is a deficient number, since it is larger than the sum of its proper divisors (1631479).

31330121 is a wasteful number, since it uses less digits than its factorization.

31330121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18399.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 31330121 is about 5597.3315963948. The cubic root of 31330121 is about 315.2492224367.

Adding to 31330121 its reverse (12103313), we get a palindrome (43433434).

The spelling of 31330121 in words is "thirty-one million, three hundred thirty thousand, one hundred twenty-one".