31424985 has 24 divisors (see below), whose sum is σ = 54609984. Its totient is φ = 16716960.

The previous prime is 31424977. The next prime is 31424989. The reversal of 31424985 is 58942413.

It is not a de Polignac number, because 31424985 - 2³ = 31424977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31424989) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25084 + ... + 26306.

It is an arithmetic number, because the mean of its divisors is an integer number (2275416).

Almost surely, 2^31424985 is an apocalyptic number.

It is an amenable number.

31424985 is a deficient number, since it is larger than the sum of its proper divisors (23184999).

31424985 is a wasteful number, since it uses less digits than its factorization.

31424985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1805 (or 1802 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 31424985 is about 5605.7992293695. The cubic root of 31424985 is about 315.5670812914.

The spelling of 31424985 in words is "thirty-one million, four hundred twenty-four thousand, nine hundred eighty-five".