81418383 has 6 divisors (see below), whose sum is σ = 117604344. Its totient is φ = 54278916.

The previous prime is 81418373. The next prime is 81418409. The reversal of 81418383 is 38381418.

It is not a de Polignac number, because 81418383 - 2¹² = 81414287 is a prime.

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 (81418343) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4523235 + ... + 4523252.

It is an arithmetic number, because the mean of its divisors is an integer number (19600724).

Almost surely, 2^81418383 is an apocalyptic number.

81418383 is a deficient number, since it is larger than the sum of its proper divisors (36185961).

81418383 is a wasteful number, since it uses less digits than its factorization.

81418383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9046493 (or 9046490 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 81418383 is about 9023.2135628057. The cubic root of 81418383 is about 433.4185460956.

The spelling of 81418383 in words is "eighty-one million, four hundred eighteen thousand, three hundred eighty-three".