2649187493 has 2 divisors, whose sum is σ = 2649187494. Its totient is φ = 2649187492.

The previous prime is 2649187451. The next prime is 2649187511. The reversal of 2649187493 is 3947819462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2157323809 + 491863684 = 46447^2 + 22178^2 .

It is a cyclic number.

It is not a de Polignac number, because 2649187493 - 2²⁰ = 2648138917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2649187393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1324593746 + 1324593747.

It is an arithmetic number, because the mean of its divisors is an integer number (1324593747).

Almost surely, 2^2649187493 is an apocalyptic number.

It is an amenable number.

2649187493 is a deficient number, since it is larger than the sum of its proper divisors (1).

2649187493 is an equidigital number, since it uses as much as digits as its factorization.

2649187493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 53.

The square root of 2649187493 is about 51470.2583343041. The cubic root of 2649187493 is about 1383.6860590575.

The spelling of 2649187493 in words is "two billion, six hundred forty-nine million, one hundred eighty-seven thousand, four hundred ninety-three".