31979085 has 16 divisors (see below), whose sum is σ = 53391744. Its totient is φ = 16313792.

The previous prime is 31979081. The next prime is 31979089. The reversal of 31979085 is 58097913.

31979085 = 1881² + 1882² + ... + 1889².

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (31979081) and next prime (31979089).

It is a cyclic number.

It is not a de Polignac number, because 31979085 - 2² = 31979081 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31979081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46002 + ... + 46691.

It is an arithmetic number, because the mean of its divisors is an integer number (3336984).

Almost surely, 2^31979085 is an apocalyptic number.

It is an amenable number.

31979085 is a deficient number, since it is larger than the sum of its proper divisors (21412659).

31979085 is a wasteful number, since it uses less digits than its factorization.

31979085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92724.

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 31979085 is about 5655.0053050373. The cubic root of 31979085 is about 317.4110276252.

It can be divided in two parts, 3197908 and 5, that added together give a palindrome (3197913).

The spelling of 31979085 in words is "thirty-one million, nine hundred seventy-nine thousand, eighty-five".