2491487491 has 2 divisors, whose sum is σ = 2491487492. Its totient is φ = 2491487490.

The previous prime is 2491487473. The next prime is 2491487503. The reversal of 2491487491 is 1947841942.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2491487491 - 2¹⁹ = 2490963203 is a prime.

It is not a weakly prime, because it can be changed into another prime (2491407491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1245743745 + 1245743746.

It is an arithmetic number, because the mean of its divisors is an integer number (1245743746).

Almost surely, 2^2491487491 is an apocalyptic number.

2491487491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2491487491 is an equidigital number, since it uses as much as digits as its factorization.

2491487491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 49.

The square root of 2491487491 is about 49914.8023235593. The cubic root of 2491487491 is about 1355.6666229625. Note that the first 4 decimals are identical.

The spelling of 2491487491 in words is "two billion, four hundred ninety-one million, four hundred eighty-seven thousand, four hundred ninety-one".