81109396 has 12 divisors (see below), whose sum is σ = 144060448. Its totient is φ = 39949272.

The previous prime is 81109393. The next prime is 81109403. The reversal of 81109396 is 69390118.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81109393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151056 + ... + 151591.

Almost surely, 2^81109396 is an apocalyptic number.

It is an amenable number.

81109396 is a deficient number, since it is larger than the sum of its proper divisors (62951052).

81109396 is a wasteful number, since it uses less digits than its factorization.

81109396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302718 (or 302716 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 81109396 is about 9006.0755049022. The cubic root of 81109396 is about 432.8695690651.

The spelling of 81109396 in words is "eighty-one million, one hundred nine thousand, three hundred ninety-six".