2102391 has 6 divisors (see below), whose sum is σ = 3036800. Its totient is φ = 1401588.

The previous prime is 2102383. The next prime is 2102411. The reversal of 2102391 is 1932012.

It is a happy number.

It is not a de Polignac number, because 2102391 - 2³ = 2102383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102311) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 116791 + ... + 116808.

2^2102391 is an apocalyptic number.

2102391 is a deficient number, since it is larger than the sum of its proper divisors (934409).

2102391 is a wasteful number, since it uses less digits than its factorization.

2102391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233605 (or 233602 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 2102391 is about 1449.9624133059. The cubic root of 2102391 is about 128.1064990935.

It can be divided in two parts, 210 and 2391, that added together give a square (2601 = 51²).

The spelling of 2102391 in words is "two million, one hundred two thousand, three hundred ninety-one".