1585202161 has 4 divisors (see below), whose sum is σ = 1607529024. Its totient is φ = 1562875300.

The previous prime is 1585202141. The next prime is 1585202173. The reversal of 1585202161 is 1612025851.

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 1585202161 - 2⁹ = 1585201649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1585202141) 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, 11163325 + ... + 11163466.

It is an arithmetic number, because the mean of its divisors is an integer number (401882256).

Almost surely, 2^1585202161 is an apocalyptic number.

It is an amenable number.

1585202161 is a deficient number, since it is larger than the sum of its proper divisors (22326863).

1585202161 is an equidigital number, since it uses as much as digits as its factorization.

1585202161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22326862.

The product of its (nonzero) digits is 4800, while the sum is 31.

The square root of 1585202161 is about 39814.5973356507. The cubic root of 1585202161 is about 1165.9901596946.

The spelling of 1585202161 in words is "one billion, five hundred eighty-five million, two hundred two thousand, one hundred sixty-one".