2791521 has 6 divisors (see below), whose sum is σ = 4032210. Its totient is φ = 1861008.

The previous prime is 2791513. The next prime is 2791531. The reversal of 2791521 is 1251972.

It can be written as a sum of positive squares in only one way, i.e., 2387025 + 404496 = 1545^2 + 636^2 .

It is not a de Polignac number, because 2791521 - 2³ = 2791513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2791501) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 155076 + ... + 155093.

It is an arithmetic number, because the mean of its divisors is an integer number (672035).

2^2791521 is an apocalyptic number.

It is an amenable number.

2791521 is a deficient number, since it is larger than the sum of its proper divisors (1240689).

2791521 is a wasteful number, since it uses less digits than its factorization.

2791521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310175 (or 310172 counting only the distinct ones).

The product of its digits is 1260, while the sum is 27.

The square root of 2791521 is about 1670.7845462536. The cubic root of 2791521 is about 140.8035592517.

The spelling of 2791521 in words is "two million, seven hundred ninety-one thousand, five hundred twenty-one".