31426985 has 4 divisors (see below), whose sum is σ = 37712388. Its totient is φ = 25141584.

The previous prime is 31426939. The next prime is 31426987. The reversal of 31426985 is 58962413.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16224784 + 15202201 = 4028^2 + 3899^2 .

It is a cyclic number.

It is not a de Polignac number, because 31426985 - 2⁸ = 31426729 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31426987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3142694 + ... + 3142703.

It is an arithmetic number, because the mean of its divisors is an integer number (9428097).

Almost surely, 2^31426985 is an apocalyptic number.

It is an amenable number.

31426985 is a deficient number, since it is larger than the sum of its proper divisors (6285403).

31426985 is an equidigital number, since it uses as much as digits as its factorization.

31426985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6285402.

The product of its digits is 51840, while the sum is 38.

The square root of 31426985 is about 5605.9776132268. The cubic root of 31426985 is about 315.5737757605.

The spelling of 31426985 in words is "thirty-one million, four hundred twenty-six thousand, nine hundred eighty-five".