31204121 has 8 divisors (see below), whose sum is σ = 34239240. Its totient is φ = 28259712.

The previous prime is 31204109. The next prime is 31204127. The reversal of 31204121 is 12140213.

It can be written as a sum of positive squares in 4 ways, for example, as 6948496 + 24255625 = 2636^2 + 4925^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-31204121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31204096 and 31204105.

It is not an unprimeable number, because it can be changed into a prime (31204127) 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, 21956 + ... + 23333.

It is an arithmetic number, because the mean of its divisors is an integer number (4279905).

Almost surely, 2^31204121 is an apocalyptic number.

It is an amenable number.

31204121 is a deficient number, since it is larger than the sum of its proper divisors (3035119).

31204121 is a wasteful number, since it uses less digits than its factorization.

31204121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45355.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 31204121 is about 5586.0648940019. The cubic root of 31204121 is about 314.8260431969.

Adding to 31204121 its reverse (12140213), we get a palindrome (43344334).

The spelling of 31204121 in words is "thirty-one million, two hundred four thousand, one hundred twenty-one".