85891515 has 16 divisors (see below), whose sum is σ = 140779296. Its totient is φ = 44691200.

The previous prime is 85891501. The next prime is 85891517. The reversal of 85891515 is 51519858.

It is not a de Polignac number, because 85891515 - 2¹² = 85887419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85891517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69216 + ... + 70445.

It is an arithmetic number, because the mean of its divisors is an integer number (8798706).

Almost surely, 2^85891515 is an apocalyptic number.

85891515 is a deficient number, since it is larger than the sum of its proper divisors (54887781).

85891515 is a wasteful number, since it uses less digits than its factorization.

85891515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139710.

The product of its digits is 72000, while the sum is 42.

The square root of 85891515 is about 9267.7675305329. The cubic root of 85891515 is about 441.2148160814.

The spelling of 85891515 in words is "eighty-five million, eight hundred ninety-one thousand, five hundred fifteen".