31196681 has 8 divisors (see below), whose sum is σ = 31948104. Its totient is φ = 30453120.

The previous prime is 31196653. The next prime is 31196699. The reversal of 31196681 is 18669113.

It can be written as a sum of positive squares in 4 ways, for example, as 781456 + 30415225 = 884^2 + 5515^2 .

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 31196681 - 2¹⁴ = 31180297 is a prime.

It is a super-2 number, since 2×31196681² = 1946465810831522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31196621) 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, 6491 + ... + 10223.

It is an arithmetic number, because the mean of its divisors is an integer number (3993513).

Almost surely, 2^31196681 is an apocalyptic number.

It is an amenable number.

31196681 is a deficient number, since it is larger than the sum of its proper divisors (751423).

31196681 is a wasteful number, since it uses less digits than its factorization.

31196681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3931.

The product of its digits is 7776, while the sum is 35.

The square root of 31196681 is about 5585.3989114476. The cubic root of 31196681 is about 314.8010198788.

The spelling of 31196681 in words is "thirty-one million, one hundred ninety-six thousand, six hundred eighty-one".