81150499 has 4 divisors (see below), whose sum is σ = 81312336. Its totient is φ = 80988664.

The previous prime is 81150493. The next prime is 81150551. The reversal of 81150499 is 99405118.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99405118 = 2 ⋅49702559.

It is a cyclic number.

It is not a de Polignac number, because 81150499 - 2¹³ = 81142307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81150493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80164 + ... + 81169.

It is an arithmetic number, because the mean of its divisors is an integer number (20328084).

Almost surely, 2^81150499 is an apocalyptic number.

81150499 is a deficient number, since it is larger than the sum of its proper divisors (161837).

81150499 is a wasteful number, since it uses less digits than its factorization.

81150499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161836.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 81150499 is about 9008.3571754233. The cubic root of 81150499 is about 432.9426770491.

The spelling of 81150499 in words is "eighty-one million, one hundred fifty thousand, four hundred ninety-nine".