81740361 has 16 divisors (see below), whose sum is σ = 110096064. Its totient is φ = 53942784.

The previous prime is 81740353. The next prime is 81740387. The reversal of 81740361 is 16304718.

It is a happy number.

It is not a de Polignac number, because 81740361 - 2³ = 81740353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81740341) 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 in 15 ways as a sum of consecutive naturals, for example, 235390 + ... + 235736.

It is an arithmetic number, because the mean of its divisors is an integer number (6881004).

Almost surely, 2^81740361 is an apocalyptic number.

It is an amenable number.

81740361 is a deficient number, since it is larger than the sum of its proper divisors (28355703).

81740361 is a wasteful number, since it uses less digits than its factorization.

81740361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 920.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 81740361 is about 9041.0376063812. The cubic root of 81740361 is about 433.9891284697.

The spelling of 81740361 in words is "eighty-one million, seven hundred forty thousand, three hundred sixty-one".