229121261 has 2 divisors, whose sum is σ = 229121262. Its totient is φ = 229121260.

The previous prime is 229121201. The next prime is 229121273. The reversal of 229121261 is 162121922.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204061225 + 25060036 = 14285^2 + 5006^2 .

It is a cyclic number.

It is not a de Polignac number, because 229121261 - 2⁶ = 229121197 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 229121261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (229121201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114560630 + 114560631.

It is an arithmetic number, because the mean of its divisors is an integer number (114560631).

Almost surely, 2^229121261 is an apocalyptic number.

It is an amenable number.

229121261 is a deficient number, since it is larger than the sum of its proper divisors (1).

229121261 is an equidigital number, since it uses as much as digits as its factorization.

229121261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 26.

The square root of 229121261 is about 15136.7519963828. The cubic root of 229121261 is about 611.9112863920.

The spelling of 229121261 in words is "two hundred twenty-nine million, one hundred twenty-one thousand, two hundred sixty-one".