85981187 has 2 divisors, whose sum is σ = 85981188. Its totient is φ = 85981186.

The previous prime is 85981177. The next prime is 85981249. The reversal of 85981187 is 78118958.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85981187 - 2⁴ = 85981171 is a prime.

It is not a weakly prime, because it can be changed into another prime (85981117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42990593 + 42990594.

It is an arithmetic number, because the mean of its divisors is an integer number (42990594).

Almost surely, 2^85981187 is an apocalyptic number.

85981187 is a deficient number, since it is larger than the sum of its proper divisors (1).

85981187 is an equidigital number, since it uses as much as digits as its factorization.

85981187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 47.

The square root of 85981187 is about 9272.6041110359. The cubic root of 85981187 is about 441.3683075887.

It can be divided in two parts, 85981 and 187, that added together give a palindrome (86168).

The spelling of 85981187 in words is "eighty-five million, nine hundred eighty-one thousand, one hundred eighty-seven".