2631191 has 4 divisors (see below), whose sum is σ = 2649000. Its totient is φ = 2613384.

The previous prime is 2631179. The next prime is 2631203. The reversal of 2631191 is 1911362.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2631179) and next prime (2631203).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2631191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2631091) 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, 8681 + ... + 8978.

It is an arithmetic number, because the mean of its divisors is an integer number (662250).

2^2631191 is an apocalyptic number.

2631191 is a deficient number, since it is larger than the sum of its proper divisors (17809).

2631191 is a wasteful number, since it uses less digits than its factorization.

2631191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17808.

The product of its digits is 324, while the sum is 23.

The square root of 2631191 is about 1622.0946334909. The cubic root of 2631191 is about 138.0545712899.

The spelling of 2631191 in words is "two million, six hundred thirty-one thousand, one hundred ninety-one".