2516721 has 16 divisors (see below), whose sum is σ = 3590400. Its totient is φ = 1563408.

The previous prime is 2516713. The next prime is 2516771. The reversal of 2516721 is 1276152.

It is not a de Polignac number, because 2516721 - 2³ = 2516713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2516691 and 2516700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2516771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3490 + ... + 4148.

It is an arithmetic number, because the mean of its divisors is an integer number (224400).

2^2516721 is an apocalyptic number.

It is an amenable number.

2516721 is a deficient number, since it is larger than the sum of its proper divisors (1073679).

2516721 is a wasteful number, since it uses less digits than its factorization.

2516721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 748.

The product of its digits is 840, while the sum is 24.

The square root of 2516721 is about 1586.4176625341. The cubic root of 2516721 is about 136.0227939015.

The spelling of 2516721 in words is "two million, five hundred sixteen thousand, seven hundred twenty-one".