2617981 has 8 divisors (see below), whose sum is σ = 2739200. Its totient is φ = 2499120.

The previous prime is 2617961. The next prime is 2617987. The reversal of 2617981 is 1897162.

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 a de Polignac number, because none of the positive numbers 2^k-2617981 is a prime.

It is a super-2 number, since 2×2617981² = 13707649032722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2617987) 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, 1915 + ... + 2983.

It is an arithmetic number, because the mean of its divisors is an integer number (342400).

2^2617981 is an apocalyptic number.

It is an amenable number.

2617981 is a deficient number, since it is larger than the sum of its proper divisors (121219).

2617981 is a wasteful number, since it uses less digits than its factorization.

2617981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1179.

The product of its digits is 6048, while the sum is 34.

The square root of 2617981 is about 1618.0176142428. The cubic root of 2617981 is about 137.8231473941.

The spelling of 2617981 in words is "two million, six hundred seventeen thousand, nine hundred eighty-one".