81418299 has 8 divisors (see below), whose sum is σ = 108601872. Its totient is φ = 54256800.

The previous prime is 81418297. The next prime is 81418301. The reversal of 81418299 is 99281418.

It is an interprime number because it is at equal distance from previous prime (81418297) and next prime (81418301).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81418299 - 2¹ = 81418297 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81418299.

It is not an unprimeable number, because it can be changed into a prime (81418291) 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, 7437 + ... + 14769.

It is an arithmetic number, because the mean of its divisors is an integer number (13575234).

Almost surely, 2^81418299 is an apocalyptic number.

81418299 is a deficient number, since it is larger than the sum of its proper divisors (27183573).

81418299 is a wasteful number, since it uses less digits than its factorization.

81418299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11037.

The product of its digits is 41472, while the sum is 42.

The square root of 81418299 is about 9023.2089081435. The cubic root of 81418299 is about 433.4183970418.

The spelling of 81418299 in words is "eighty-one million, four hundred eighteen thousand, two hundred ninety-nine".