73725581 has 2 divisors, whose sum is σ = 73725582. Its totient is φ = 73725580.

The previous prime is 73725551. The next prime is 73725593. The reversal of 73725581 is 18552737.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72403081 + 1322500 = 8509^2 + 1150^2 .

It is a cyclic number.

It is not a de Polignac number, because 73725581 - 2⁶ = 73725517 is a prime.

It is a super-2 number, since 2×73725581² = 10870922587575122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73725551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36862790 + 36862791.

It is an arithmetic number, because the mean of its divisors is an integer number (36862791).

Almost surely, 2^73725581 is an apocalyptic number.

It is an amenable number.

73725581 is a deficient number, since it is larger than the sum of its proper divisors (1).

73725581 is an equidigital number, since it uses as much as digits as its factorization.

73725581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58800, while the sum is 38.

The square root of 73725581 is about 8586.3601718074. The cubic root of 73725581 is about 419.3140371050.

The spelling of 73725581 in words is "seventy-three million, seven hundred twenty-five thousand, five hundred eighty-one".