31120245 has 24 divisors (see below), whose sum is σ = 58092216. Its totient is φ = 15320448.

The previous prime is 31120231. The next prime is 31120247. The reversal of 31120245 is 54202113.

It can be written as a sum of positive squares in 4 ways, for example, as 1602756 + 29517489 = 1266^2 + 5433^2 .

It is not a de Polignac number, because 31120245 - 2⁵ = 31120213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31120247) 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 23 ways as a sum of consecutive naturals, for example, 26014 + ... + 27183.

It is an arithmetic number, because the mean of its divisors is an integer number (2420509).

Almost surely, 2^31120245 is an apocalyptic number.

It is an amenable number.

31120245 is a deficient number, since it is larger than the sum of its proper divisors (26971971).

31120245 is a wasteful number, since it uses less digits than its factorization.

31120245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53221 (or 53218 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 31120245 is about 5578.5522315382. The cubic root of 31120245 is about 314.5437082185.

Adding to 31120245 its reverse (54202113), we get a palindrome (85322358).

The spelling of 31120245 in words is "thirty-one million, one hundred twenty thousand, two hundred forty-five".