31121325 has 36 divisors (see below), whose sum is σ = 56160468. Its totient is φ = 16473600.

The previous prime is 31121309. The next prime is 31121341. The reversal of 31121325 is 52312113.

It is an interprime number because it is at equal distance from previous prime (31121309) and next prime (31121341).

It can be written as a sum of positive squares in 6 ways, for example, as 5294601 + 25826724 = 2301^2 + 5082^2 .

It is not a de Polignac number, because 31121325 - 2⁴ = 31121309 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31121298 and 31121307.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 34885 + ... + 35765.

It is an arithmetic number, because the mean of its divisors is an integer number (1560013).

Almost surely, 2^31121325 is an apocalyptic number.

It is an amenable number.

31121325 is a deficient number, since it is larger than the sum of its proper divisors (25039143).

31121325 is a wasteful number, since it uses less digits than its factorization.

31121325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1054 (or 1046 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 31121325 is about 5578.6490300072. The cubic root of 31121325 is about 314.5473468282.

Adding to 31121325 its reverse (52312113), we get a palindrome (83433438).

The spelling of 31121325 in words is "thirty-one million, one hundred twenty-one thousand, three hundred twenty-five".