85187513 has 4 divisors (see below), whose sum is σ = 85299060. Its totient is φ = 85075968.

The previous prime is 85187503. The next prime is 85187519. The reversal of 85187513 is 31578158.

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 19123129 + 66064384 = 4373^2 + 8128^2 .

It is a cyclic number.

It is not a de Polignac number, because 85187513 - 2⁴ = 85187497 is a prime.

It is a super-2 number, since 2×85187513² = 14513824742250338, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (85187519) 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, 54620 + ... + 56157.

It is an arithmetic number, because the mean of its divisors is an integer number (21324765).

Almost surely, 2^85187513 is an apocalyptic number.

It is an amenable number.

85187513 is a deficient number, since it is larger than the sum of its proper divisors (111547).

85187513 is a wasteful number, since it uses less digits than its factorization.

85187513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111546.

The product of its digits is 33600, while the sum is 38.

The square root of 85187513 is about 9229.7081752350. The cubic root of 85187513 is about 440.0060484706.

The spelling of 85187513 in words is "eighty-five million, one hundred eighty-seven thousand, five hundred thirteen".