81045833 has 8 divisors (see below), whose sum is σ = 88524576. Its totient is φ = 73585600.

The previous prime is 81045793. The next prime is 81045857. The reversal of 81045833 is 33854018.

It is a happy number.

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

It is not a de Polignac number, because 81045833 - 2²² = 76851529 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 81045833.

It is not an unprimeable number, because it can be changed into a prime (81045883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5510 + ... + 13872.

It is an arithmetic number, because the mean of its divisors is an integer number (11065572).

Almost surely, 2^81045833 is an apocalyptic number.

It is an amenable number.

81045833 is a deficient number, since it is larger than the sum of its proper divisors (7478743).

81045833 is a wasteful number, since it uses less digits than its factorization.

81045833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9255.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 81045833 is about 9002.5459176835. The cubic root of 81045833 is about 432.7564638831.

The spelling of 81045833 in words is "eighty-one million, forty-five thousand, eight hundred thirty-three".