31225645 has 16 divisors (see below), whose sum is σ = 43030080. Its totient is φ = 21513600.

The previous prime is 31225643. The next prime is 31225657. The reversal of 31225645 is 54652213.

It is not a de Polignac number, because 31225645 - 2¹ = 31225643 is a prime.

It is a super-3 number, since 3×31225645³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31225643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13896 + ... + 15985.

It is an arithmetic number, because the mean of its divisors is an integer number (2689380).

Almost surely, 2^31225645 is an apocalyptic number.

It is an amenable number.

31225645 is a deficient number, since it is larger than the sum of its proper divisors (11804435).

31225645 is a wasteful number, since it uses less digits than its factorization.

31225645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29916.

The product of its digits is 7200, while the sum is 28.

The square root of 31225645 is about 5587.9911417253. The cubic root of 31225645 is about 314.8984135343.

Adding to 31225645 its reverse (54652213), we get a palindrome (85877858).

The spelling of 31225645 in words is "thirty-one million, two hundred twenty-five thousand, six hundred forty-five".