2149640491 has 2 divisors, whose sum is σ = 2149640492. Its totient is φ = 2149640490.

The previous prime is 2149640483. The next prime is 2149640503. The reversal of 2149640491 is 1940469412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2149640491 - 2³ = 2149640483 is a prime.

It is not a weakly prime, because it can be changed into another prime (2149640401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1074820245 + 1074820246.

It is an arithmetic number, because the mean of its divisors is an integer number (1074820246).

Almost surely, 2^2149640491 is an apocalyptic number.

2149640491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2149640491 is an equidigital number, since it uses as much as digits as its factorization.

2149640491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 2149640491 is about 46364.2156301603. The cubic root of 2149640491 is about 1290.5909379164.

The spelling of 2149640491 in words is "two billion, one hundred forty-nine million, six hundred forty thousand, four hundred ninety-one".