229577981 has 2 divisors, whose sum is σ = 229577982. Its totient is φ = 229577980.

The previous prime is 229577947. The next prime is 229577993. The reversal of 229577981 is 189775922.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197655481 + 31922500 = 14059^2 + 5650^2 .

It is a cyclic number.

It is not a de Polignac number, because 229577981 - 2¹⁸ = 229315837 is a prime.

It is a super-2 number, since 2×229577981² = 105412098720072722, 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 (229577941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114788990 + 114788991.

It is an arithmetic number, because the mean of its divisors is an integer number (114788991).

Almost surely, 2^229577981 is an apocalyptic number.

It is an amenable number.

229577981 is a deficient number, since it is larger than the sum of its proper divisors (1).

229577981 is an equidigital number, since it uses as much as digits as its factorization.

229577981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 635040, while the sum is 50.

The square root of 229577981 is about 15151.8309454666. The cubic root of 229577981 is about 612.3176019985.

The spelling of 229577981 in words is "two hundred twenty-nine million, five hundred seventy-seven thousand, nine hundred eighty-one".