85311491 has 4 divisors (see below), whose sum is σ = 90329832. Its totient is φ = 80293152.

The previous prime is 85311469. The next prime is 85311493. The reversal of 85311491 is 19411358.

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 85311491 - 2²² = 81117187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85311493) 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, 2509145 + ... + 2509178.

It is an arithmetic number, because the mean of its divisors is an integer number (22582458).

Almost surely, 2^85311491 is an apocalyptic number.

85311491 is a deficient number, since it is larger than the sum of its proper divisors (5018341).

85311491 is a wasteful number, since it uses less digits than its factorization.

85311491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5018340.

The product of its digits is 4320, while the sum is 32.

The square root of 85311491 is about 9236.4219803991. The cubic root of 85311491 is about 440.2193998786.

The spelling of 85311491 in words is "eighty-five million, three hundred eleven thousand, four hundred ninety-one".