81699316 has 12 divisors (see below), whose sum is σ = 150498880. Its totient is φ = 38699640.

The previous prime is 81699311. The next prime is 81699323. The reversal of 81699316 is 61399618.

81699316 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

81699316 is strictly pandigital in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81699311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 537420 + ... + 537571.

Almost surely, 2^81699316 is an apocalyptic number.

It is an amenable number.

81699316 is a deficient number, since it is larger than the sum of its proper divisors (68799564).

81699316 is a wasteful number, since it uses less digits than its factorization.

81699316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1075014 (or 1075012 counting only the distinct ones).

The product of its digits is 69984, while the sum is 43.

The square root of 81699316 is about 9038.7673938430. The cubic root of 81699316 is about 433.9164753930.

The spelling of 81699316 in words is "eighty-one million, six hundred ninety-nine thousand, three hundred sixteen".