81241814 has 4 divisors (see below), whose sum is σ = 121862724. Its totient is φ = 40620906.

The previous prime is 81241807. The next prime is 81241817. The reversal of 81241814 is 41814218.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81241817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20310452 + ... + 20310455.

It is an arithmetic number, because the mean of its divisors is an integer number (30465681).

Almost surely, 2^81241814 is an apocalyptic number.

81241814 is a deficient number, since it is larger than the sum of its proper divisors (40620910).

81241814 is a wasteful number, since it uses less digits than its factorization.

81241814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40620909.

The product of its digits is 2048, while the sum is 29.

The square root of 81241814 is about 9013.4240996416. The cubic root of 81241814 is about 433.1050064726.

The spelling of 81241814 in words is "eighty-one million, two hundred forty-one thousand, eight hundred fourteen".