2521999 has 4 divisors (see below), whose sum is σ = 2528136. Its totient is φ = 2515864.

The previous prime is 2521979. The next prime is 2522011. The reversal of 2521999 is 9991252.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2521999 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 (2521919) 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, 2404 + ... + 3289.

It is an arithmetic number, because the mean of its divisors is an integer number (632034).

2^2521999 is an apocalyptic number.

2521999 is a deficient number, since it is larger than the sum of its proper divisors (6137).

2521999 is an equidigital number, since it uses as much as digits as its factorization.

2521999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6136.

The product of its digits is 14580, while the sum is 37.

The square root of 2521999 is about 1588.0802876429. The cubic root of 2521999 is about 136.1178152960.

The spelling of 2521999 in words is "two million, five hundred twenty-one thousand, nine hundred ninety-nine".