172036985 has 4 divisors (see below), whose sum is σ = 206444388. Its totient is φ = 137629584.

The previous prime is 172036981. The next prime is 172037003. The reversal of 172036985 is 589630271.

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 76545001 + 95491984 = 8749^2 + 9772^2 .

It is a cyclic number.

It is not a de Polignac number, because 172036985 - 2² = 172036981 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172036981) 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, 17203694 + ... + 17203703.

It is an arithmetic number, because the mean of its divisors is an integer number (51611097).

Almost surely, 2^172036985 is an apocalyptic number.

It is an amenable number.

172036985 is a deficient number, since it is larger than the sum of its proper divisors (34407403).

172036985 is an equidigital number, since it uses as much as digits as its factorization.

172036985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34407402.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 172036985 is about 13116.2870127182. The cubic root of 172036985 is about 556.1696351515.

The spelling of 172036985 in words is "one hundred seventy-two million, thirty-six thousand, nine hundred eighty-five".