2617991 has 8 divisors (see below), whose sum is σ = 2772480. Its totient is φ = 2465208.

The previous prime is 2617987. The next prime is 2617997. The reversal of 2617991 is 1997162.

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 2617991 - 2² = 2617987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2617997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4010 + ... + 4616.

It is an arithmetic number, because the mean of its divisors is an integer number (346560).

2^2617991 is an apocalyptic number.

2617991 is a deficient number, since it is larger than the sum of its proper divisors (154489).

2617991 is a wasteful number, since it uses less digits than its factorization.

2617991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 853.

The product of its digits is 6804, while the sum is 35.

The square root of 2617991 is about 1618.0207044411. The cubic root of 2617991 is about 137.8233228766.

The spelling of 2617991 in words is "two million, six hundred seventeen thousand, nine hundred ninety-one".