81974299 has 8 divisors (see below), whose sum is σ = 90762048. Its totient is φ = 73409160.

The previous prime is 81974281. The next prime is 81974317. The reversal of 81974299 is 99247918.

It is an interprime number because it is at equal distance from previous prime (81974281) and next prime (81974317).

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

It is not a de Polignac number, because 81974299 - 2⁷ = 81974171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81974209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54877 + ... + 56350.

It is an arithmetic number, because the mean of its divisors is an integer number (11345256).

Almost surely, 2^81974299 is an apocalyptic number.

81974299 is a deficient number, since it is larger than the sum of its proper divisors (8787749).

81974299 is a wasteful number, since it uses less digits than its factorization.

81974299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111305.

The product of its digits is 326592, while the sum is 49.

The square root of 81974299 is about 9053.9659265981. The cubic root of 81974299 is about 434.4027545987.

The spelling of 81974299 in words is "eighty-one million, nine hundred seventy-four thousand, two hundred ninety-nine".