31361885 has 8 divisors (see below), whose sum is σ = 37705176. Its totient is φ = 25042240.

The previous prime is 31361879. The next prime is 31361887. The reversal of 31361885 is 58816313.

It can be written as a sum of positive squares in 4 ways, for example, as 5331481 + 26030404 = 2309^2 + 5102^2 .

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

It is not a de Polignac number, because 31361885 - 2¹⁸ = 31099741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31361887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2846 + ... + 8415.

It is an arithmetic number, because the mean of its divisors is an integer number (4713147).

Almost surely, 2^31361885 is an apocalyptic number.

It is an amenable number.

31361885 is a deficient number, since it is larger than the sum of its proper divisors (6343291).

31361885 is a wasteful number, since it uses less digits than its factorization.

31361885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11823.

The product of its digits is 17280, while the sum is 35.

The square root of 31361885 is about 5600.1683010424. The cubic root of 31361885 is about 315.3557247823.

The spelling of 31361885 in words is "thirty-one million, three hundred sixty-one thousand, eight hundred eighty-five".