1580641 has 4 divisors (see below), whose sum is σ = 1585152. Its totient is φ = 1576132.

The previous prime is 1580633. The next prime is 1580647. The reversal of 1580641 is 1460851.

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 1580641 - 2³ = 1580633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1580647) 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, 1681 + ... + 2446.

It is an arithmetic number, because the mean of its divisors is an integer number (396288).

2^1580641 is an apocalyptic number.

It is an amenable number.

1580641 is a deficient number, since it is larger than the sum of its proper divisors (4511).

1580641 is an equidigital number, since it uses as much as digits as its factorization.

1580641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4510.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 1580641 is about 1257.2354592518. The cubic root of 1580641 is about 116.4870769802.

It can be divided in two parts, 15 and 80641, that added together give a square (80656 = 284²).

The spelling of 1580641 in words is "one million, five hundred eighty thousand, six hundred forty-one".