81959506 has 8 divisors (see below), whose sum is σ = 122984064. Its totient is φ = 40964820.

The previous prime is 81959503. The next prime is 81959513. The reversal of 81959506 is 60595918.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (81959503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1591 + ... + 12901.

It is an arithmetic number, because the mean of its divisors is an integer number (15373008).

Almost surely, 2^81959506 is an apocalyptic number.

81959506 is a deficient number, since it is larger than the sum of its proper divisors (41024558).

81959506 is a wasteful number, since it uses less digits than its factorization.

81959506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14936.

The product of its (nonzero) digits is 97200, while the sum is 43.

The square root of 81959506 is about 9053.1489549217. The cubic root of 81959506 is about 434.3766223979.

The spelling of 81959506 in words is "eighty-one million, nine hundred fifty-nine thousand, five hundred six".