31321245 has 16 divisors (see below), whose sum is σ = 50185152. Its totient is φ = 16680960.

The previous prime is 31321237. The next prime is 31321249. The reversal of 31321245 is 54212313.

It is not a de Polignac number, because 31321245 - 2³ = 31321237 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31321249) 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 15 ways as a sum of consecutive naturals, for example, 16390 + ... + 18200.

It is an arithmetic number, because the mean of its divisors is an integer number (3136572).

Almost surely, 2^31321245 is an apocalyptic number.

It is an amenable number.

31321245 is a deficient number, since it is larger than the sum of its proper divisors (18863907).

31321245 is a wasteful number, since it uses less digits than its factorization.

31321245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2972.

The product of its digits is 720, while the sum is 21.

The square root of 31321245 is about 5596.5386624234. The cubic root of 31321245 is about 315.2194489972.

Adding to 31321245 its reverse (54212313), we get a palindrome (85533558).

The spelling of 31321245 in words is "thirty-one million, three hundred twenty-one thousand, two hundred forty-five".