2090691 has 20 divisors (see below), whose sum is σ = 3188592. Its totient is φ = 1364688.

The previous prime is 2090689. The next prime is 2090717. The reversal of 2090691 is 1960902.

It is a happy number.

It is not a de Polignac number, because 2090691 - 2¹ = 2090689 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (2090651) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4050 + ... + 4536.

2^2090691 is an apocalyptic number.

2090691 is a deficient number, since it is larger than the sum of its proper divisors (1097901).

2090691 is an equidigital number, since it uses as much as digits as its factorization.

2090691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552 (or 543 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 2090691 is about 1445.9221970770. The cubic root of 2090691 is about 127.8684153952.

The spelling of 2090691 in words is "two million, ninety thousand, six hundred ninety-one".