31000085 has 8 divisors (see below), whose sum is σ = 37648800. Its totient is φ = 24500944.

The previous prime is 31000063. The next prime is 31000087. The reversal of 31000085 is 58000013.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31000085 - 2¹⁰ = 30999061 is a prime.

It is a super-2 number, since 2×31000085² = 1922010540014450, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31000087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36935 + ... + 37764.

It is an arithmetic number, because the mean of its divisors is an integer number (4706100).

Almost surely, 2^31000085 is an apocalyptic number.

It is an amenable number.

31000085 is a deficient number, since it is larger than the sum of its proper divisors (6648715).

31000085 is an equidigital number, since it uses as much as digits as its factorization.

31000085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74787.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 31000085 is about 5567.7719960501. The cubic root of 31000085 is about 314.1383523543.

Adding to 31000085 its reverse (58000013), we get a palindrome (89000098).

It can be divided in two parts, 3100008 and 5, that added together give a palindrome (3100013).

The spelling of 31000085 in words is "thirty-one million, eighty-five", and thus it is an aban number and an uban number.