85781513 has 8 divisors (see below), whose sum is σ = 89900928. Its totient is φ = 81694624.

The previous prime is 85781477. The next prime is 85781543. The reversal of 85781513 is 31518758.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 85781513 - 2¹⁴ = 85765129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85781543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2645 + ... + 13362.

It is an arithmetic number, because the mean of its divisors is an integer number (11237616).

Almost surely, 2^85781513 is an apocalyptic number.

It is an amenable number.

85781513 is a deficient number, since it is larger than the sum of its proper divisors (4119415).

85781513 is a wasteful number, since it uses less digits than its factorization.

85781513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16263.

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

The square root of 85781513 is about 9261.8309744888. The cubic root of 85781513 is about 441.0263797480.

The spelling of 85781513 in words is "eighty-five million, seven hundred eighty-one thousand, five hundred thirteen".