31343985 has 12 divisors (see below), whose sum is σ = 54329652. Its totient is φ = 16716768.

The previous prime is 31343969. The next prime is 31343987. The reversal of 31343985 is 58934313.

It can be written as a sum of positive squares in 2 ways, for example, as 4064256 + 27279729 = 2016^2 + 5223^2 .

It is not a de Polignac number, because 31343985 - 2⁴ = 31343969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31343987) 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, 348222 + ... + 348311.

It is an arithmetic number, because the mean of its divisors is an integer number (4527471).

Almost surely, 2^31343985 is an apocalyptic number.

It is an amenable number.

31343985 is a deficient number, since it is larger than the sum of its proper divisors (22985667).

31343985 is a wasteful number, since it uses less digits than its factorization.

31343985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696544 (or 696541 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 31343985 is about 5598.5699066815. The cubic root of 31343985 is about 315.2957162532.

The spelling of 31343985 in words is "thirty-one million, three hundred forty-three thousand, nine hundred eighty-five".