2291649 has 4 divisors (see below), whose sum is σ = 3055536. Its totient is φ = 1527764.

The previous prime is 2291629. The next prime is 2291657. The reversal of 2291649 is 9461922.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2291649 - 2¹¹ = 2289601 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (2291629) 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, 381939 + ... + 381944.

It is an arithmetic number, because the mean of its divisors is an integer number (763884).

2^2291649 is an apocalyptic number.

It is an amenable number.

2291649 is a deficient number, since it is larger than the sum of its proper divisors (763887).

2291649 is an equidigital number, since it uses as much as digits as its factorization.

2291649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763886.

The product of its digits is 7776, while the sum is 33.

The square root of 2291649 is about 1513.8193419295. The cubic root of 2291649 is about 131.8406594321.

The spelling of 2291649 in words is "two million, two hundred ninety-one thousand, six hundred forty-nine".