81499363 has 8 divisors (see below), whose sum is σ = 90800640. Its totient is φ = 72513480.

The previous prime is 81499357. The next prime is 81499387. The reversal of 81499363 is 36399418.

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

It is a de Polignac number, because none of the positive numbers 2^k-81499363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81499333) 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, 78303 + ... + 79336.

It is an arithmetic number, because the mean of its divisors is an integer number (11350080).

Almost surely, 2^81499363 is an apocalyptic number.

81499363 is a deficient number, since it is larger than the sum of its proper divisors (9301277).

81499363 is a wasteful number, since it uses less digits than its factorization.

81499363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157697.

The product of its digits is 139968, while the sum is 43.

The square root of 81499363 is about 9027.6997623979. The cubic root of 81499363 is about 433.5621934415.

The spelling of 81499363 in words is "eighty-one million, four hundred ninety-nine thousand, three hundred sixty-three".