81369033 has 4 divisors (see below), whose sum is σ = 108492048. Its totient is φ = 54246020.

The previous prime is 81369019. The next prime is 81369047. The reversal of 81369033 is 33096318.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (81369019) and next prime (81369047).

It is a cyclic number.

It is not a de Polignac number, because 81369033 - 2¹⁰ = 81368009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81368985 and 81369003.

It is not an unprimeable number, because it can be changed into a prime (81369433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13561503 + ... + 13561508.

It is an arithmetic number, because the mean of its divisors is an integer number (27123012).

Almost surely, 2^81369033 is an apocalyptic number.

It is an amenable number.

81369033 is a deficient number, since it is larger than the sum of its proper divisors (27123015).

81369033 is a wasteful number, since it uses less digits than its factorization.

81369033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27123014.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 81369033 is about 9020.4785349781. The cubic root of 81369033 is about 433.3309592901.

The spelling of 81369033 in words is "eighty-one million, three hundred sixty-nine thousand, thirty-three".