81960542 has 8 divisors (see below), whose sum is σ = 123155616. Its totient is φ = 40908672.

The previous prime is 81960539. The next prime is 81960551. The reversal of 81960542 is 24506918.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34358 + ... + 36665.

It is an arithmetic number, because the mean of its divisors is an integer number (15394452).

Almost surely, 2^81960542 is an apocalyptic number.

81960542 is a deficient number, since it is larger than the sum of its proper divisors (41195074).

81960542 is a wasteful number, since it uses less digits than its factorization.

81960542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71602.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 81960542 is about 9053.2061724010. The cubic root of 81960542 is about 434.3784526199.

The spelling of 81960542 in words is "eighty-one million, nine hundred sixty thousand, five hundred forty-two".