73406581 has 2 divisors, whose sum is σ = 73406582. Its totient is φ = 73406580.

The previous prime is 73406573. The next prime is 73406587. The reversal of 73406581 is 18560437.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51969681 + 21436900 = 7209^2 + 4630^2 .

It is a cyclic number.

It is not a de Polignac number, because 73406581 - 2³ = 73406573 is a prime.

It is a super-2 number, since 2×73406581² = 10777052268219122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73406587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36703290 + 36703291.

It is an arithmetic number, because the mean of its divisors is an integer number (36703291).

Almost surely, 2^73406581 is an apocalyptic number.

It is an amenable number.

73406581 is a deficient number, since it is larger than the sum of its proper divisors (1).

73406581 is an equidigital number, since it uses as much as digits as its factorization.

73406581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 73406581 is about 8567.7640607104. The cubic root of 73406581 is about 418.7083922125.

The spelling of 73406581 in words is "seventy-three million, four hundred six thousand, five hundred eighty-one".