85172377 has 4 divisors (see below), whose sum is σ = 86129460. Its totient is φ = 84215296.

The previous prime is 85172357. The next prime is 85172411. The reversal of 85172377 is 77327158.

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

It can be written as a sum of positive squares in 2 ways, for example, as 48944016 + 36228361 = 6996^2 + 6019^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85172377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85172327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 478408 + ... + 478585.

It is an arithmetic number, because the mean of its divisors is an integer number (21532365).

Almost surely, 2^85172377 is an apocalyptic number.

It is an amenable number.

85172377 is a deficient number, since it is larger than the sum of its proper divisors (957083).

85172377 is an equidigital number, since it uses as much as digits as its factorization.

85172377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 957082.

The product of its digits is 82320, while the sum is 40.

The square root of 85172377 is about 9228.8881778901. Note that the first 3 decimals coincide. The cubic root of 85172377 is about 439.9799870374.

The spelling of 85172377 in words is "eighty-five million, one hundred seventy-two thousand, three hundred seventy-seven".