31325645 has 16 divisors (see below), whose sum is σ = 42865200. Its totient is φ = 21771264.

The previous prime is 31325627. The next prime is 31325647. The reversal of 31325645 is 54652313.

It can be written as a sum of positive squares in 8 ways, for example, as 5080516 + 26245129 = 2254^2 + 5123^2 .

It is a cyclic number.

It is not a de Polignac number, because 31325645 - 2⁸ = 31325389 is a prime.

It is a super-3 number, since 3×31325645³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31325647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13070 + ... + 15279.

It is an arithmetic number, because the mean of its divisors is an integer number (2679075).

Almost surely, 2^31325645 is an apocalyptic number.

It is an amenable number.

31325645 is a deficient number, since it is larger than the sum of its proper divisors (11539555).

31325645 is a wasteful number, since it uses less digits than its factorization.

31325645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28384.

The product of its digits is 10800, while the sum is 29.

The square root of 31325645 is about 5596.9317487352. The cubic root of 31325645 is about 315.2342089537.

Adding to 31325645 its reverse (54652313), we get a palindrome (85977958).

The spelling of 31325645 in words is "thirty-one million, three hundred twenty-five thousand, six hundred forty-five".