85961861 has 4 divisors (see below), whose sum is σ = 86012652. Its totient is φ = 85911072.

The previous prime is 85961857. The next prime is 85961867. The reversal of 85961861 is 16816958.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 44809636 + 41152225 = 6694^2 + 6415^2 .

It is a cyclic number.

It is not a de Polignac number, because 85961861 - 2² = 85961857 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 (85961867) 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, 22766 + ... + 26271.

It is an arithmetic number, because the mean of its divisors is an integer number (21503163).

Almost surely, 2^85961861 is an apocalyptic number.

It is an amenable number.

85961861 is a deficient number, since it is larger than the sum of its proper divisors (50791).

85961861 is a wasteful number, since it uses less digits than its factorization.

85961861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50790.

The product of its digits is 103680, while the sum is 44.

The square root of 85961861 is about 9271.5619503943. The cubic root of 85961861 is about 441.3352363112.

The spelling of 85961861 in words is "eighty-five million, nine hundred sixty-one thousand, eight hundred sixty-one".