85187551 has 4 divisors (see below), whose sum is σ = 85248432. Its totient is φ = 85126672.

The previous prime is 85187521. The next prime is 85187567. The reversal of 85187551 is 15578158.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15578158 = 2 ⋅7789079.

It is a cyclic number.

It is not a de Polignac number, because 85187551 - 2⁵ = 85187519 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85187521) 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, 28291 + ... + 31156.

It is an arithmetic number, because the mean of its divisors is an integer number (21312108).

Almost surely, 2^85187551 is an apocalyptic number.

85187551 is a deficient number, since it is larger than the sum of its proper divisors (60881).

85187551 is a wasteful number, since it uses less digits than its factorization.

85187551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60880.

The product of its digits is 56000, while the sum is 40.

The square root of 85187551 is about 9229.7102338047. The cubic root of 85187551 is about 440.0061138958.

The spelling of 85187551 in words is "eighty-five million, one hundred eighty-seven thousand, five hundred fifty-one".