81162346 has 4 divisors (see below), whose sum is σ = 121743522. Its totient is φ = 40581172.

The previous prime is 81162317. The next prime is 81162407. The reversal of 81162346 is 64326118.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 69906321 + 11256025 = 8361^2 + 3355^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 20290585 + ... + 20290588.

Almost surely, 2^81162346 is an apocalyptic number.

81162346 is a deficient number, since it is larger than the sum of its proper divisors (40581176).

81162346 is a wasteful number, since it uses less digits than its factorization.

81162346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40581175.

The product of its digits is 6912, while the sum is 31.

The square root of 81162346 is about 9009.0147075027. The cubic root of 81162346 is about 432.9637441708.

The spelling of 81162346 in words is "eighty-one million, one hundred sixty-two thousand, three hundred forty-six".