8181494 has 4 divisors (see below), whose sum is σ = 12272244. Its totient is φ = 4090746.

The previous prime is 8181449. The next prime is 8181499. The reversal of 8181494 is 4941818.

It is a semiprime because it is the product of two primes.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8181499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2045372 + ... + 2045375.

It is an arithmetic number, because the mean of its divisors is an integer number (3068061).

Almost surely, 2^8181494 is an apocalyptic number.

8181494 is a deficient number, since it is larger than the sum of its proper divisors (4090750).

8181494 is a wasteful number, since it uses less digits than its factorization.

8181494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4090749.

The product of its digits is 9216, while the sum is 35.

The square root of 8181494 is about 2860.3310997156. The cubic root of 8181494 is about 201.5011544861.

The spelling of 8181494 in words is "eight million, one hundred eighty-one thousand, four hundred ninety-four".