31305445 has 16 divisors (see below), whose sum is σ = 39744000. Its totient is φ = 23606208.

The previous prime is 31305401. The next prime is 31305451. The reversal of 31305445 is 54450313.

It is not a de Polignac number, because 31305445 - 2¹⁵ = 31272677 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 21036 + ... + 22474.

It is an arithmetic number, because the mean of its divisors is an integer number (2484000).

Almost surely, 2^31305445 is an apocalyptic number.

It is an amenable number.

31305445 is a deficient number, since it is larger than the sum of its proper divisors (8438555).

31305445 is a wasteful number, since it uses less digits than its factorization.

31305445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1692.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 31305445 is about 5595.1268975779. The cubic root of 31305445 is about 315.1664359386.

Adding to 31305445 its reverse (54450313), we get a palindrome (85755758).

The spelling of 31305445 in words is "thirty-one million, three hundred five thousand, four hundred forty-five".