3116981 has 4 divisors (see below), whose sum is σ = 3562272. Its totient is φ = 2671692.

The previous prime is 3116977. The next prime is 3116999. The reversal of 3116981 is 1896113.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1896113 = 1373 ⋅1381.

It is a cyclic number.

It is not a de Polignac number, because 3116981 - 2² = 3116977 is a prime.

It is a super-2 number, since 2×3116981² = 19431141108722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3116951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 222635 + ... + 222648.

It is an arithmetic number, because the mean of its divisors is an integer number (890568).

Almost surely, 2^3116981 is an apocalyptic number.

It is an amenable number.

3116981 is a deficient number, since it is larger than the sum of its proper divisors (445291).

3116981 is an equidigital number, since it uses as much as digits as its factorization.

3116981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445290.

The product of its digits is 1296, while the sum is 29.

The square root of 3116981 is about 1765.4973803436. The cubic root of 3116981 is about 146.0757254007.

The spelling of 3116981 in words is "three million, one hundred sixteen thousand, nine hundred eighty-one".