2491589231 has 4 divisors (see below), whose sum is σ = 2491908264. Its totient is φ = 2491270200.

The previous prime is 2491589227. The next prime is 2491589249. The reversal of 2491589231 is 1329851942.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1329851942 = 2 ⋅664925971.

It is a cyclic number.

It is not a de Polignac number, because 2491589231 - 2² = 2491589227 is a prime.

It is a super-2 number, since 2×2491589231² = 12416033792070342722, 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 (2491589281) 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, 147500 + ... + 163521.

It is an arithmetic number, because the mean of its divisors is an integer number (622977066).

Almost surely, 2^2491589231 is an apocalyptic number.

2491589231 is a deficient number, since it is larger than the sum of its proper divisors (319033).

2491589231 is an equidigital number, since it uses as much as digits as its factorization.

2491589231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319032.

The product of its digits is 155520, while the sum is 44.

The square root of 2491589231 is about 49915.8214497167. The cubic root of 2491589231 is about 1355.6850756131.

The spelling of 2491589231 in words is "two billion, four hundred ninety-one million, five hundred eighty-nine thousand, two hundred thirty-one".