1585071161 has 4 divisors (see below), whose sum is σ = 1589210112. Its totient is φ = 1580932212.

The previous prime is 1585071121. The next prime is 1585071179. The reversal of 1585071161 is 1611705851.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1611705851 = 7 ⋅230243693.

It is a cyclic number.

It is not a de Polignac number, because 1585071161 - 2⁶ = 1585071097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1585071101) 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, 2068901 + ... + 2069666.

It is an arithmetic number, because the mean of its divisors is an integer number (397302528).

Almost surely, 2^1585071161 is an apocalyptic number.

It is an amenable number.

1585071161 is a deficient number, since it is larger than the sum of its proper divisors (4138951).

1585071161 is an equidigital number, since it uses as much as digits as its factorization.

1585071161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4138950.

The product of its (nonzero) digits is 8400, while the sum is 35.

The square root of 1585071161 is about 39812.9521763961. The cubic root of 1585071161 is about 1165.9580399389.

The spelling of 1585071161 in words is "one billion, five hundred eighty-five million, seventy-one thousand, one hundred sixty-one".