81813342 has 16 divisors (see below), whose sum is σ = 176213520. Its totient is φ = 25173312.

The previous prime is 81813341. The next prime is 81813343. The reversal of 81813342 is 24331818.

It is an interprime number because it is at equal distance from previous prime (81813341) and next prime (81813343).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81813341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 524367 + ... + 524522.

It is an arithmetic number, because the mean of its divisors is an integer number (11013345).

Almost surely, 2^81813342 is an apocalyptic number.

81813342 is an abundant number, since it is smaller than the sum of its proper divisors (94400178).

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

81813342 is a wasteful number, since it uses less digits than its factorization.

81813342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1048907.

The product of its digits is 4608, while the sum is 30.

The square root of 81813342 is about 9045.0728023604. The cubic root of 81813342 is about 434.1182508868.

The spelling of 81813342 in words is "eighty-one million, eight hundred thirteen thousand, three hundred forty-two".