85673491 has 4 divisors (see below), whose sum is σ = 88437184. Its totient is φ = 82909800.

The previous prime is 85673449. The next prime is 85673507. The reversal of 85673491 is 19437658.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19437658 = 2 ⋅9718829.

It is a cyclic number.

It is not a de Polignac number, because 85673491 - 2⁷ = 85673363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85673431) 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, 1381800 + ... + 1381861.

It is an arithmetic number, because the mean of its divisors is an integer number (22109296).

Almost surely, 2^85673491 is an apocalyptic number.

85673491 is a deficient number, since it is larger than the sum of its proper divisors (2763693).

85673491 is a wasteful number, since it uses less digits than its factorization.

85673491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2763692.

The product of its digits is 181440, while the sum is 43.

The square root of 85673491 is about 9255.9975691440. The cubic root of 85673491 is about 440.8411783709.

It can be divided in two parts, 856 and 73491, that added together give a palindrome (74347).

The spelling of 85673491 in words is "eighty-five million, six hundred seventy-three thousand, four hundred ninety-one".