81003217 has 16 divisors (see below), whose sum is σ = 88178688. Its totient is φ = 74186640.

The previous prime is 81003187. The next prime is 81003229. The reversal of 81003217 is 71230018.

It is a cyclic number.

It is not a de Polignac number, because 81003217 - 2¹¹ = 81001169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81003277) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72888 + ... + 73990.

It is an arithmetic number, because the mean of its divisors is an integer number (5511168).

Almost surely, 2^81003217 is an apocalyptic number.

It is an amenable number.

81003217 is a deficient number, since it is larger than the sum of its proper divisors (7175471).

81003217 is a wasteful number, since it uses less digits than its factorization.

81003217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1260.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 81003217 is about 9000.1787204477. The cubic root of 81003217 is about 432.6805990619.

The spelling of 81003217 in words is "eighty-one million, three thousand, two hundred seventeen".