81946292 has 6 divisors (see below), whose sum is σ = 143406018. Its totient is φ = 40973144.

The previous prime is 81946289. The next prime is 81946303. The reversal of 81946292 is 29264918.

It can be written as a sum of positive squares in only one way, i.e., 74580496 + 7365796 = 8636^2 + 2714^2 .

It is a congruent 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, 10243283 + ... + 10243290.

It is an arithmetic number, because the mean of its divisors is an integer number (23901003).

Almost surely, 2^81946292 is an apocalyptic number.

It is an amenable number.

81946292 is a deficient number, since it is larger than the sum of its proper divisors (61459726).

81946292 is a wasteful number, since it uses less digits than its factorization.

81946292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20486577 (or 20486575 counting only the distinct ones).

The product of its digits is 62208, while the sum is 41.

The square root of 81946292 is about 9052.4191241900. The cubic root of 81946292 is about 434.3532768806.

The spelling of 81946292 in words is "eighty-one million, nine hundred forty-six thousand, two hundred ninety-two".