2801581 has 4 divisors (see below), whose sum is σ = 2827872. Its totient is φ = 2775292.

The previous prime is 2801573. The next prime is 2801587. The reversal of 2801581 is 1851082.

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 2801581 - 2³ = 2801573 is a prime.

It is a super-2 number, since 2×2801581² = 15697712199122, which contains 22 as substring.

It is a Duffinian number.

2801581 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2801587) 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, 12985 + ... + 13198.

It is an arithmetic number, because the mean of its divisors is an integer number (706968).

2^2801581 is an apocalyptic number.

It is an amenable number.

2801581 is a deficient number, since it is larger than the sum of its proper divisors (26291).

2801581 is a wasteful number, since it uses less digits than its factorization.

2801581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26290.

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 2801581 is about 1673.7924005085. The cubic root of 2801581 is about 140.9724976958.

The spelling of 2801581 in words is "two million, eight hundred one thousand, five hundred eighty-one".