2039581 has 4 divisors (see below), whose sum is σ = 2047072. Its totient is φ = 2032092.

The previous prime is 2039579. The next prime is 2039603. The reversal of 2039581 is 1859302.

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 2039581 - 2¹ = 2039579 is a prime.

It is a super-2 number, since 2×2039581² = 8319781311122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2039501) 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, 3321 + ... + 3886.

It is an arithmetic number, because the mean of its divisors is an integer number (511768).

2^2039581 is an apocalyptic number.

It is an amenable number.

2039581 is a deficient number, since it is larger than the sum of its proper divisors (7491).

2039581 is an equidigital number, since it uses as much as digits as its factorization.

2039581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7490.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 2039581 is about 1428.1389988373. The cubic root of 2039581 is about 126.8178304561.

It can be divided in two parts, 20 and 39581, that added together give a square (39601 = 199²).

The spelling of 2039581 in words is "two million, thirty-nine thousand, five hundred eighty-one".