81109377 has 8 divisors (see below), whose sum is σ = 120162080. Its totient is φ = 54072900.

The previous prime is 81109373. The next prime is 81109393. The reversal of 81109377 is 77390118.

It is not a de Polignac number, because 81109377 - 2² = 81109373 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81109373) 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 7 ways as a sum of consecutive naturals, for example, 1501999 + ... + 1502052.

It is an arithmetic number, because the mean of its divisors is an integer number (15020260).

Almost surely, 2^81109377 is an apocalyptic number.

It is an amenable number.

81109377 is a deficient number, since it is larger than the sum of its proper divisors (39052703).

81109377 is a wasteful number, since it uses less digits than its factorization.

81109377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3004060 (or 3004054 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 36.

The square root of 81109377 is about 9006.0744500587. The cubic root of 81109377 is about 432.8695352650.

The spelling of 81109377 in words is "eighty-one million, one hundred nine thousand, three hundred seventy-seven".