81141590 has 32 divisors (see below), whose sum is σ = 156284640. Its totient is φ = 30240000.

The previous prime is 81141589. The next prime is 81141637. The reversal of 81141590 is 9514118.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8090 + ... + 15090.

It is an arithmetic number, because the mean of its divisors is an integer number (4883895).

Almost surely, 2^81141590 is an apocalyptic number.

81141590 is a deficient number, since it is larger than the sum of its proper divisors (75143050).

81141590 is a wasteful number, since it uses less digits than its factorization.

81141590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7088.

The product of its (nonzero) digits is 1440, while the sum is 29.

The square root of 81141590 is about 9007.8626765732. The cubic root of 81141590 is about 432.9268331233.

The spelling of 81141590 in words is "eighty-one million, one hundred forty-one thousand, five hundred ninety".