1580161 has 4 divisors (see below), whose sum is σ = 1723824. Its totient is φ = 1436500.

The previous prime is 1580141. The next prime is 1580171. The reversal of 1580161 is 1610851.

1580161 = 374² + 375² + ... + 384².

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 1580161 - 2¹⁷ = 1449089 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1580141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71815 + ... + 71836.

It is an arithmetic number, because the mean of its divisors is an integer number (430956).

2^1580161 is an apocalyptic number.

1580161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1580161 is a deficient number, since it is larger than the sum of its proper divisors (143663).

1580161 is a wasteful number, since it uses less digits than its factorization.

1580161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143662.

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 1580161 is about 1257.0445497277. The cubic root of 1580161 is about 116.4752844105.

The spelling of 1580161 in words is "one million, five hundred eighty thousand, one hundred sixty-one".