81190377 has 16 divisors (see below), whose sum is σ = 120652480. Its totient is φ = 53960256.

The previous prime is 81190331. The next prime is 81190379. The reversal of 81190377 is 77309118.

It is not a de Polignac number, because 81190377 - 2⁸ = 81190121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81190379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4638 + ... + 13560.

It is an arithmetic number, because the mean of its divisors is an integer number (7540780).

Almost surely, 2^81190377 is an apocalyptic number.

It is an amenable number.

81190377 is a deficient number, since it is larger than the sum of its proper divisors (39462103).

81190377 is a wasteful number, since it uses less digits than its factorization.

81190377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9269 (or 9263 counting only the distinct ones).

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

The square root of 81190377 is about 9010.5702927173. The cubic root of 81190377 is about 433.0135825930.

The spelling of 81190377 in words is "eighty-one million, one hundred ninety thousand, three hundred seventy-seven".