85191861 has 8 divisors (see below), whose sum is σ = 113636320. Its totient is φ = 56770992.

The previous prime is 85191859. The next prime is 85191863. The reversal of 85191861 is 16819158.

It is an interprime number because it is at equal distance from previous prime (85191859) and next prime (85191863).

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

It is not a de Polignac number, because 85191861 - 2¹ = 85191859 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85191863) 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, 5910 + ... + 14328.

It is an arithmetic number, because the mean of its divisors is an integer number (14204540).

Almost surely, 2^85191861 is an apocalyptic number.

It is an amenable number.

85191861 is a deficient number, since it is larger than the sum of its proper divisors (28444459).

85191861 is a wasteful number, since it uses less digits than its factorization.

85191861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11795.

The product of its digits is 17280, while the sum is 39.

The square root of 85191861 is about 9229.9437159714. The cubic root of 85191861 is about 440.0135343633.

The spelling of 85191861 in words is "eighty-five million, one hundred ninety-one thousand, eight hundred sixty-one".