31500045 has 12 divisors (see below), whose sum is σ = 54600156. Its totient is φ = 16800000.

The previous prime is 31500023. The next prime is 31500047. The reversal of 31500045 is 54000513.

It can be written as a sum of positive squares in 2 ways, for example, as 20331081 + 11168964 = 4509^2 + 3342^2 .

It is not a de Polignac number, because 31500045 - 2¹⁰ = 31499021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31500047) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 349956 + ... + 350045.

It is an arithmetic number, because the mean of its divisors is an integer number (4550013).

Almost surely, 2^31500045 is an apocalyptic number.

It is an amenable number.

31500045 is a deficient number, since it is larger than the sum of its proper divisors (23100111).

31500045 is a wasteful number, since it uses less digits than its factorization.

31500045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700012 (or 700009 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 31500045 is about 5612.4900890781. The cubic root of 31500045 is about 315.8181302723.

Adding to 31500045 its reverse (54000513), we get a palindrome (85500558).

The spelling of 31500045 in words is "thirty-one million, five hundred thousand, forty-five".