85638961 has 4 divisors (see below), whose sum is σ = 85688932. Its totient is φ = 85588992.

The previous prime is 85638953. The next prime is 85639003. The reversal of 85638961 is 16983658.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16983658 = 2 ⋅8491829.

It can be written as a sum of positive squares in 2 ways, for example, as 54110736 + 31528225 = 7356^2 + 5615^2 .

It is a cyclic number.

It is not a de Polignac number, because 85638961 - 2³ = 85638953 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85638661) 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, 22320 + ... + 25873.

It is an arithmetic number, because the mean of its divisors is an integer number (21422233).

Almost surely, 2^85638961 is an apocalyptic number.

It is an amenable number.

85638961 is a deficient number, since it is larger than the sum of its proper divisors (49971).

85638961 is a wasteful number, since it uses less digits than its factorization.

85638961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49970.

The product of its digits is 311040, while the sum is 46.

The square root of 85638961 is about 9254.1321040927. The cubic root of 85638961 is about 440.7819446015.

The spelling of 85638961 in words is "eighty-five million, six hundred thirty-eight thousand, nine hundred sixty-one".