3131985 has 8 divisors (see below), whose sum is σ = 5011200. Its totient is φ = 1670384.

The previous prime is 3131983. The next prime is 3132007. The reversal of 3131985 is 5891313.

It is a happy number.

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 3131985 - 2¹ = 3131983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3131981) 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, 104385 + ... + 104414.

It is an arithmetic number, because the mean of its divisors is an integer number (626400).

Almost surely, 2^3131985 is an apocalyptic number.

It is an amenable number.

3131985 is a deficient number, since it is larger than the sum of its proper divisors (1879215).

3131985 is a wasteful number, since it uses less digits than its factorization.

3131985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208807.

The product of its digits is 3240, while the sum is 30.

The square root of 3131985 is about 1769.7415065483. The cubic root of 3131985 is about 146.3097352591.

The spelling of 3131985 in words is "three million, one hundred thirty-one thousand, nine hundred eighty-five".