2599721 has 2 divisors, whose sum is σ = 2599722. Its totient is φ = 2599720.

The previous prime is 2599693. The next prime is 2599739. The reversal of 2599721 is 1279952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2544025 + 55696 = 1595^2 + 236^2 .

It is a cyclic number.

It is not a de Polignac number, because 2599721 - 2¹⁰ = 2598697 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2599741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1299860 + 1299861.

It is an arithmetic number, because the mean of its divisors is an integer number (1299861).

2^2599721 is an apocalyptic number.

It is an amenable number.

2599721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2599721 is an equidigital number, since it uses as much as digits as its factorization.

2599721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 35.

The square root of 2599721 is about 1612.3650331113. The cubic root of 2599721 is about 137.5019680159.

The spelling of 2599721 in words is "two million, five hundred ninety-nine thousand, seven hundred twenty-one".