81670059 has 8 divisors (see below), whose sum is σ = 120992720. Its totient is φ = 54446688.

The previous prime is 81670051. The next prime is 81670081. The reversal of 81670059 is 95007618.

It is not a de Polignac number, because 81670059 - 2³ = 81670051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81670051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1512382 + ... + 1512435.

It is an arithmetic number, because the mean of its divisors is an integer number (15124090).

Almost surely, 2^81670059 is an apocalyptic number.

81670059 is a deficient number, since it is larger than the sum of its proper divisors (39322661).

81670059 is a wasteful number, since it uses less digits than its factorization.

81670059 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3024826 (or 3024820 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 81670059 is about 9037.1488313516. The cubic root of 81670059 is about 433.8646732048.

The spelling of 81670059 in words is "eighty-one million, six hundred seventy thousand, fifty-nine".