2025991 has 4 divisors (see below), whose sum is σ = 2210184. Its totient is φ = 1841800.

The previous prime is 2025979. The next prime is 2026021. The reversal of 2025991 is 1995202.

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 2025991 - 2⁹ = 2025479 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 (2025901) 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, 92080 + ... + 92101.

It is an arithmetic number, because the mean of its divisors is an integer number (552546).

2^2025991 is an apocalyptic number.

2025991 is a deficient number, since it is larger than the sum of its proper divisors (184193).

2025991 is a wasteful number, since it uses less digits than its factorization.

2025991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184192.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 2025991 is about 1423.3731063920. The cubic root of 2025991 is about 126.5355344980.

The spelling of 2025991 in words is "two million, twenty-five thousand, nine hundred ninety-one".