81848515 has 16 divisors (see below), whose sum is σ = 112432320. Its totient is φ = 56033280.

The previous prime is 81848491. The next prime is 81848521. The reversal of 81848515 is 51584818.

It is not a de Polignac number, because 81848515 - 2⁹ = 81848003 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25395 + ... + 28435.

It is an arithmetic number, because the mean of its divisors is an integer number (7027020).

Almost surely, 2^81848515 is an apocalyptic number.

81848515 is a deficient number, since it is larger than the sum of its proper divisors (30583805).

81848515 is a wasteful number, since it uses less digits than its factorization.

81848515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3822.

The product of its digits is 51200, while the sum is 40.

The square root of 81848515 is about 9047.0169116676. The cubic root of 81848515 is about 434.1804536736.

The spelling of 81848515 in words is "eighty-one million, eight hundred forty-eight thousand, five hundred fifteen".