81041292 has 18 divisors (see below), whose sum is σ = 204854468. Its totient is φ = 27013752.

The previous prime is 81041291. The next prime is 81041299. The reversal of 81041292 is 29214018.

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (81041291) 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 5 ways as a sum of consecutive naturals, for example, 1125538 + ... + 1125609.

Almost surely, 2^81041292 is an apocalyptic number.

It is an amenable number.

81041292 is an abundant number, since it is smaller than the sum of its proper divisors (123813176).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81041292 is a wasteful number, since it uses less digits than its factorization.

81041292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2251157 (or 2251152 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 81041292 is about 9002.2937077169. The cubic root of 81041292 is about 432.7483812804.

The spelling of 81041292 in words is "eighty-one million, forty-one thousand, two hundred ninety-two".