81389062 has 4 divisors (see below), whose sum is σ = 122083596. Its totient is φ = 40694530.

The previous prime is 81389023. The next prime is 81389069. The reversal of 81389062 is 26098318.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81389069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20347264 + ... + 20347267.

It is an arithmetic number, because the mean of its divisors is an integer number (30520899).

Almost surely, 2^81389062 is an apocalyptic number.

81389062 is a deficient number, since it is larger than the sum of its proper divisors (40694534).

81389062 is a wasteful number, since it uses less digits than its factorization.

81389062 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40694533.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 81389062 is about 9021.5886627578. The cubic root of 81389062 is about 433.3665112007.

The spelling of 81389062 in words is "eighty-one million, three hundred eighty-nine thousand, sixty-two".