85092991 has 4 divisors (see below), whose sum is σ = 85585032. Its totient is φ = 84600952.

The previous prime is 85092979. The next prime is 85093027. The reversal of 85092991 is 19929058.

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

It is a cyclic number.

It is not a de Polignac number, because 85092991 - 2¹⁵ = 85060223 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 (85092911) 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, 245761 + ... + 246106.

It is an arithmetic number, because the mean of its divisors is an integer number (21396258).

Almost surely, 2^85092991 is an apocalyptic number.

85092991 is a deficient number, since it is larger than the sum of its proper divisors (492041).

85092991 is a wasteful number, since it uses less digits than its factorization.

85092991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492040.

The product of its (nonzero) digits is 58320, while the sum is 43.

The square root of 85092991 is about 9224.5862237826. The cubic root of 85092991 is about 439.8432482265.

The spelling of 85092991 in words is "eighty-five million, ninety-two thousand, nine hundred ninety-one".