85291561 has 8 divisors (see below), whose sum is σ = 85966920. Its totient is φ = 84619392.

The previous prime is 85291553. The next prime is 85291573. The reversal of 85291561 is 16519258.

It can be written as a sum of positive squares in 4 ways, for example, as 26677225 + 58614336 = 5165^2 + 7656^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 85291561 - 2³ = 85291553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 85291561.

It is not an unprimeable number, because it can be changed into a prime (85291501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83691 + ... + 84703.

It is an arithmetic number, because the mean of its divisors is an integer number (10745865).

Almost surely, 2^85291561 is an apocalyptic number.

It is an amenable number.

85291561 is a deficient number, since it is larger than the sum of its proper divisors (675359).

85291561 is a wasteful number, since it uses less digits than its factorization.

85291561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1595.

The product of its digits is 21600, while the sum is 37.

The square root of 85291561 is about 9235.3430364010. The cubic root of 85291561 is about 440.1851166661.

The spelling of 85291561 in words is "eighty-five million, two hundred ninety-one thousand, five hundred sixty-one".