31310145 has 40 divisors (see below), whose sum is σ = 56776104. Its totient is φ = 16505856.

The previous prime is 31310137. The next prime is 31310161. The reversal of 31310145 is 54101313.

It can be written as a sum of positive squares in 4 ways, for example, as 2537649 + 28772496 = 1593^2 + 5364^2 .

It is not a de Polignac number, because 31310145 - 2³ = 31310137 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 38887 + ... + 39683.

Almost surely, 2^31310145 is an apocalyptic number.

It is an amenable number.

31310145 is a deficient number, since it is larger than the sum of its proper divisors (25465959).

31310145 is an equidigital number, since it uses as much as digits as its factorization.

31310145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911 (or 902 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 31310145 is about 5595.5468901619. The cubic root of 31310145 is about 315.1822075094.

Adding to 31310145 its reverse (54101313), we get a palindrome (85411458).

The spelling of 31310145 in words is "thirty-one million, three hundred ten thousand, one hundred forty-five".