31325121 has 6 divisors (see below), whose sum is σ = 45247410. Its totient is φ = 20883408.

The previous prime is 31325117. The next prime is 31325131. The reversal of 31325121 is 12152313.

It can be written as a sum of positive squares in only one way, i.e., 29582721 + 1742400 = 5439^2 + 1320^2 .

It is not a de Polignac number, because 31325121 - 2² = 31325117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31325094 and 31325103.

It is not an unprimeable number, because it can be changed into a prime (31325131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1740276 + ... + 1740293.

It is an arithmetic number, because the mean of its divisors is an integer number (7541235).

Almost surely, 2^31325121 is an apocalyptic number.

It is an amenable number.

31325121 is a deficient number, since it is larger than the sum of its proper divisors (13922289).

31325121 is a wasteful number, since it uses less digits than its factorization.

31325121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3480575 (or 3480572 counting only the distinct ones).

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

The square root of 31325121 is about 5596.8849371771. The cubic root of 31325121 is about 315.2324512495.

Adding to 31325121 its reverse (12152313), we get a palindrome (43477434).

The spelling of 31325121 in words is "thirty-one million, three hundred twenty-five thousand, one hundred twenty-one".