2650891 has 4 divisors (see below), whose sum is σ = 2654272. Its totient is φ = 2647512.

The previous prime is 2650873. The next prime is 2650897. The reversal of 2650891 is 1980562.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1980562 = 2 ⋅990281.

It is a cyclic number.

It is not a de Polignac number, because 2650891 - 2⁹ = 2650379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2650897) 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, 166 + ... + 2308.

It is an arithmetic number, because the mean of its divisors is an integer number (663568).

2^2650891 is an apocalyptic number.

2650891 is a deficient number, since it is larger than the sum of its proper divisors (3381).

2650891 is a wasteful number, since it uses less digits than its factorization.

2650891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3380.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 2650891 is about 1628.1557050847. The cubic root of 2650891 is about 138.3982579386.

The spelling of 2650891 in words is "two million, six hundred fifty thousand, eight hundred ninety-one".