73217581 has 2 divisors, whose sum is σ = 73217582. Its totient is φ = 73217580.

The previous prime is 73217569. The next prime is 73217593. The reversal of 73217581 is 18571237.

It is a balanced prime because it is at equal distance from previous prime (73217569) and next prime (73217593).

It can be written as a sum of positive squares in only one way, i.e., 36796356 + 36421225 = 6066^2 + 6035^2 .

It is a cyclic number.

It is not a de Polignac number, because 73217581 - 2⁵ = 73217549 is a prime.

It is a super-2 number, since 2×73217581² = 10721628334983122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73217281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36608790 + 36608791.

It is an arithmetic number, because the mean of its divisors is an integer number (36608791).

Almost surely, 2^73217581 is an apocalyptic number.

It is an amenable number.

73217581 is a deficient number, since it is larger than the sum of its proper divisors (1).

73217581 is an equidigital number, since it uses as much as digits as its factorization.

73217581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11760, while the sum is 34.

The square root of 73217581 is about 8556.7272365081. The cubic root of 73217581 is about 418.3487337212.

The spelling of 73217581 in words is "seventy-three million, two hundred seventeen thousand, five hundred eighty-one".