81350590 has 16 divisors (see below), whose sum is σ = 154138320. Its totient is φ = 30827520.

The previous prime is 81350579. The next prime is 81350611. The reversal of 81350590 is 9505318.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 213891 + ... + 214270.

It is an arithmetic number, because the mean of its divisors is an integer number (9633645).

Almost surely, 2^81350590 is an apocalyptic number.

81350590 is a deficient number, since it is larger than the sum of its proper divisors (72787730).

81350590 is a wasteful number, since it uses less digits than its factorization.

81350590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428187.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 81350590 is about 9019.4561920329. The cubic root of 81350590 is about 433.2982174042.

The spelling of 81350590 in words is "eighty-one million, three hundred fifty thousand, five hundred ninety".