81745033 has 8 divisors (see below), whose sum is σ = 82498752. Its totient is φ = 80994576.

The previous prime is 81745009. The next prime is 81745039. The reversal of 81745033 is 33054718.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81745033 is a prime.

It is a super-3 number, since 3×81745033³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81744986 and 81745004.

It is not an unprimeable number, because it can be changed into a prime (81745039) 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, 91716 + ... + 92602.

It is an arithmetic number, because the mean of its divisors is an integer number (10312344).

Almost surely, 2^81745033 is an apocalyptic number.

It is an amenable number.

81745033 is a deficient number, since it is larger than the sum of its proper divisors (753719).

81745033 is a wasteful number, since it uses less digits than its factorization.

81745033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1631.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 81745033 is about 9041.2959801126. The cubic root of 81745033 is about 433.9973967579.

It can be divided in two parts, 8 and 1745033, that added together give a square (1745041 = 1321²).

The spelling of 81745033 in words is "eighty-one million, seven hundred forty-five thousand, thirty-three".