85120661 has 4 divisors (see below), whose sum is σ = 85502592. Its totient is φ = 84738732.

The previous prime is 85120643. The next prime is 85120667. The reversal of 85120661 is 16602158.

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.

It is a cyclic number.

It is not a de Polignac number, because 85120661 - 2¹⁰ = 85119637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85120667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190631 + ... + 191076.

It is an arithmetic number, because the mean of its divisors is an integer number (21375648).

Almost surely, 2^85120661 is an apocalyptic number.

It is an amenable number.

85120661 is a deficient number, since it is larger than the sum of its proper divisors (381931).

85120661 is a wasteful number, since it uses less digits than its factorization.

85120661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381930.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 85120661 is about 9226.0858981477. The cubic root of 85120661 is about 439.8909182074.

It can be divided in two parts, 851 and 20661, that added together give a palindrome (21512).

The spelling of 85120661 in words is "eighty-five million, one hundred twenty thousand, six hundred sixty-one".