2491610991 has 8 divisors (see below), whose sum is σ = 3342529920. Its totient is φ = 1650883032.

The previous prime is 2491610977. The next prime is 2491611007. The reversal of 2491610991 is 1990161942.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2491610991 - 2¹⁷ = 2491479919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2491610911) 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, 2547171 + ... + 2548148.

It is an arithmetic number, because the mean of its divisors is an integer number (417816240).

Almost surely, 2^2491610991 is an apocalyptic number.

2491610991 is a deficient number, since it is larger than the sum of its proper divisors (850918929).

2491610991 is a wasteful number, since it uses less digits than its factorization.

2491610991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5095485.

The product of its (nonzero) digits is 34992, while the sum is 42.

The square root of 2491610991 is about 49916.0394162037. The cubic root of 2491610991 is about 1355.6890221734.

The spelling of 2491610991 in words is "two billion, four hundred ninety-one million, six hundred ten thousand, nine hundred ninety-one".