81158306 has 32 divisors (see below), whose sum is σ = 136598400. Its totient is φ = 35963136.

The previous prime is 81158303. The next prime is 81158351. The reversal of 81158306 is 60385118.

It is not an unprimeable number, because it can be changed into a prime (81158303) 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 15 ways as a sum of consecutive naturals, for example, 51620 + ... + 53168.

It is an arithmetic number, because the mean of its divisors is an integer number (4268700).

Almost surely, 2^81158306 is an apocalyptic number.

81158306 is a deficient number, since it is larger than the sum of its proper divisors (55440094).

81158306 is a wasteful number, since it uses less digits than its factorization.

81158306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1658.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 81158306 is about 9008.7904848542. The cubic root of 81158306 is about 432.9565602050.

The spelling of 81158306 in words is "eighty-one million, one hundred fifty-eight thousand, three hundred six".