81937059 has 16 divisors (see below), whose sum is σ = 118369152. Its totient is φ = 50214528.

The previous prime is 81937043. The next prime is 81937067. The reversal of 81937059 is 95073918.

It is a happy number.

It is not a de Polignac number, because 81937059 - 2⁴ = 81937043 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81937059.

It is not an unprimeable number, because it can be changed into a prime (81937039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16489 + ... + 20874.

It is an arithmetic number, because the mean of its divisors is an integer number (7398072).

Almost surely, 2^81937059 is an apocalyptic number.

81937059 is a deficient number, since it is larger than the sum of its proper divisors (36432093).

81937059 is a wasteful number, since it uses less digits than its factorization.

81937059 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37426.

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 81937059 is about 9051.9091356465. The cubic root of 81937059 is about 434.3369632101.

The spelling of 81937059 in words is "eighty-one million, nine hundred thirty-seven thousand, fifty-nine".