2491151 has 4 divisors (see below), whose sum is σ = 2682792. Its totient is φ = 2299512.

The previous prime is 2491123. The next prime is 2491171. The reversal of 2491151 is 1511942.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2491151 - 2⁶ = 2491087 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 (2491171) 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, 95801 + ... + 95826.

It is an arithmetic number, because the mean of its divisors is an integer number (670698).

2^2491151 is an apocalyptic number.

2491151 is a deficient number, since it is larger than the sum of its proper divisors (191641).

2491151 is a wasteful number, since it uses less digits than its factorization.

2491151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191640.

The product of its digits is 360, while the sum is 23.

The square root of 2491151 is about 1578.3380499754. The cubic root of 2491151 is about 135.5605589790.

The spelling of 2491151 in words is "two million, four hundred ninety-one thousand, one hundred fifty-one".