2520991 has 4 divisors (see below), whose sum is σ = 2750184. Its totient is φ = 2291800.

The previous prime is 2520983. The next prime is 2521003. The reversal of 2520991 is 1990252.

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 2520991 - 2³ = 2520983 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2520971) 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, 114580 + ... + 114601.

It is an arithmetic number, because the mean of its divisors is an integer number (687546).

2^2520991 is an apocalyptic number.

2520991 is a deficient number, since it is larger than the sum of its proper divisors (229193).

2520991 is a wasteful number, since it uses less digits than its factorization.

2520991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229192.

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

The square root of 2520991 is about 1587.7628916183. The cubic root of 2520991 is about 136.0996782228.

The spelling of 2520991 in words is "two million, five hundred twenty thousand, nine hundred ninety-one".