31085361 has 12 divisors (see below), whose sum is σ = 46449780. Its totient is φ = 20008800.

The previous prime is 31085359. The next prime is 31085363. The reversal of 31085361 is 16358013.

It is an interprime number because it is at equal distance from previous prime (31085359) and next prime (31085363).

It can be written as a sum of positive squares in 2 ways, for example, as 18870336 + 12215025 = 4344^2 + 3495^2 .

It is not a de Polignac number, because 31085361 - 2¹ = 31085359 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31085363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59290 + ... + 59811.

It is an arithmetic number, because the mean of its divisors is an integer number (3870815).

Almost surely, 2^31085361 is an apocalyptic number.

It is an amenable number.

31085361 is a deficient number, since it is larger than the sum of its proper divisors (15364419).

31085361 is a wasteful number, since it uses less digits than its factorization.

31085361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119136 (or 119133 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 31085361 is about 5575.4247371837. The cubic root of 31085361 is about 314.4261358243.

The spelling of 31085361 in words is "thirty-one million, eighty-five thousand, three hundred sixty-one".