85579961 has 2 divisors, whose sum is σ = 85579962. Its totient is φ = 85579960.

The previous prime is 85579943. The next prime is 85579969. The reversal of 85579961 is 16997558.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61716736 + 23863225 = 7856^2 + 4885^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85579961 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (85579969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42789980 + 42789981.

It is an arithmetic number, because the mean of its divisors is an integer number (42789981).

Almost surely, 2^85579961 is an apocalyptic number.

It is an amenable number.

85579961 is a deficient number, since it is larger than the sum of its proper divisors (1).

85579961 is an equidigital number, since it uses as much as digits as its factorization.

85579961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 680400, while the sum is 50.

The square root of 85579961 is about 9250.9437896898. The cubic root of 85579961 is about 440.6806974241.

The spelling of 85579961 in words is "eighty-five million, five hundred seventy-nine thousand, nine hundred sixty-one".