81256033 has 8 divisors (see below), whose sum is σ = 87081408. Its totient is φ = 75621744.

The previous prime is 81256009. The next prime is 81256051. The reversal of 81256033 is 33065218.

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

It is a cyclic number.

It is not a de Polignac number, because 81256033 - 2⁹ = 81255521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81255992 and 81256010.

It is not an unprimeable number, because it can be changed into a prime (81256333) 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, 46891 + ... + 48592.

It is an arithmetic number, because the mean of its divisors is an integer number (10885176).

Almost surely, 2^81256033 is an apocalyptic number.

It is an amenable number.

81256033 is a deficient number, since it is larger than the sum of its proper divisors (5825375).

81256033 is a wasteful number, since it uses less digits than its factorization.

81256033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95543.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 81256033 is about 9014.2128330764. The cubic root of 81256033 is about 433.1302724472.

The spelling of 81256033 in words is "eighty-one million, two hundred fifty-six thousand, thirty-three".