2991649 has 2 divisors, whose sum is σ = 2991650. Its totient is φ = 2991648.

The previous prime is 2991631. The next prime is 2991661. The reversal of 2991649 is 9461992.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2560000 + 431649 = 1600^2 + 657^2 .

It is a cyclic number.

It is not a de Polignac number, because 2991649 - 2¹³ = 2983457 is a prime.

It is not a weakly prime, because it can be changed into another prime (2991619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1495824 + 1495825.

It is an arithmetic number, because the mean of its divisors is an integer number (1495825).

2^2991649 is an apocalyptic number.

It is an amenable number.

2991649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2991649 is an equidigital number, since it uses as much as digits as its factorization.

2991649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 40.

The square root of 2991649 is about 1729.6384015163. The cubic root of 2991649 is about 144.0910079287.

The spelling of 2991649 in words is "two million, nine hundred ninety-one thousand, six hundred forty-nine".