2053991 has 4 divisors (see below), whose sum is σ = 2174832. Its totient is φ = 1933152.

The previous prime is 2053979. The next prime is 2054009. The reversal of 2053991 is 1993502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2053991 - 2⁶ = 2053927 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 (2053951) 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, 60395 + ... + 60428.

It is an arithmetic number, because the mean of its divisors is an integer number (543708).

2^2053991 is an apocalyptic number.

2053991 is a deficient number, since it is larger than the sum of its proper divisors (120841).

2053991 is a wasteful number, since it uses less digits than its factorization.

2053991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120840.

The product of its (nonzero) digits is 2430, while the sum is 29.

The square root of 2053991 is about 1433.1751463098. The cubic root of 2053991 is about 127.1157932909.

The spelling of 2053991 in words is "two million, fifty-three thousand, nine hundred ninety-one".