2536721 has 4 divisors (see below), whose sum is σ = 2767344. Its totient is φ = 2306100.

The previous prime is 2536697. The next prime is 2536727. The reversal of 2536721 is 1276352.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2536721 - 2⁶ = 2536657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2536727) 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, 115295 + ... + 115316.

It is an arithmetic number, because the mean of its divisors is an integer number (691836).

2^2536721 is an apocalyptic number.

It is an amenable number.

2536721 is a deficient number, since it is larger than the sum of its proper divisors (230623).

2536721 is a wasteful number, since it uses less digits than its factorization.

2536721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230622.

The product of its digits is 2520, while the sum is 26.

The square root of 2536721 is about 1592.7086990407. The cubic root of 2536721 is about 136.3821611332.

The spelling of 2536721 in words is "two million, five hundred thirty-six thousand, seven hundred twenty-one".