81349194 has 32 divisors (see below), whose sum is σ = 165634560. Its totient is φ = 26631792.

The previous prime is 81349193. The next prime is 81349201. The reversal of 81349194 is 49194318.

It is not an unprimeable number, because it can be changed into a prime (81349193) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85429 + ... + 86375.

It is an arithmetic number, because the mean of its divisors is an integer number (5176080).

Almost surely, 2^81349194 is an apocalyptic number.

81349194 is an abundant number, since it is smaller than the sum of its proper divisors (84285366).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81349194 is a wasteful number, since it uses less digits than its factorization.

81349194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1194.

The product of its digits is 31104, while the sum is 39.

The square root of 81349194 is about 9019.3788034432. The cubic root of 81349194 is about 433.2957388819.

The spelling of 81349194 in words is "eighty-one million, three hundred forty-nine thousand, one hundred ninety-four".