229913581 has 2 divisors, whose sum is σ = 229913582. Its totient is φ = 229913580.

The previous prime is 229913557. The next prime is 229913587. The reversal of 229913581 is 185319922.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131308681 + 98604900 = 11459^2 + 9930^2 .

It is a cyclic number.

It is not a de Polignac number, because 229913581 - 2⁹ = 229913069 is a prime.

It is a super-2 number, since 2×229913581² = 105720509456487122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (229913587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114956790 + 114956791.

It is an arithmetic number, because the mean of its divisors is an integer number (114956791).

Almost surely, 2^229913581 is an apocalyptic number.

It is an amenable number.

229913581 is a deficient number, since it is larger than the sum of its proper divisors (1).

229913581 is an equidigital number, since it uses as much as digits as its factorization.

229913581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 40.

The square root of 229913581 is about 15162.9014703651. The cubic root of 229913581 is about 612.6158212737.

The spelling of 229913581 in words is "two hundred twenty-nine million, nine hundred thirteen thousand, five hundred eighty-one".