85178459 has 4 divisors (see below), whose sum is σ = 85207416. Its totient is φ = 85149504.

The previous prime is 85178441. The next prime is 85178491. The reversal of 85178459 is 95487158.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85178459 is a prime.

It is a super-2 number, since 2×85178459² = 14510739755229362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85174459) 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, 9494 + ... + 16139.

It is an arithmetic number, because the mean of its divisors is an integer number (21301854).

Almost surely, 2^85178459 is an apocalyptic number.

85178459 is a deficient number, since it is larger than the sum of its proper divisors (28957).

85178459 is a wasteful number, since it uses less digits than its factorization.

85178459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28956.

The product of its digits is 403200, while the sum is 47.

The square root of 85178459 is about 9229.2176808221. The cubic root of 85178459 is about 439.9904595039.

The spelling of 85178459 in words is "eighty-five million, one hundred seventy-eight thousand, four hundred fifty-nine".