229890161 has 2 divisors, whose sum is σ = 229890162. Its totient is φ = 229890160.

The previous prime is 229890131. The next prime is 229890181. The reversal of 229890161 is 161098922.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157979761 + 71910400 = 12569^2 + 8480^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-229890161 is a prime.

It is a super-2 number, since 2×229890161² = 105698972249211842, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (229890121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114945080 + 114945081.

It is an arithmetic number, because the mean of its divisors is an integer number (114945081).

Almost surely, 2^229890161 is an apocalyptic number.

It is an amenable number.

229890161 is a deficient number, since it is larger than the sum of its proper divisors (1).

229890161 is an equidigital number, since it uses as much as digits as its factorization.

229890161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 229890161 is about 15162.1291710630. The cubic root of 229890161 is about 612.5950193277.

The spelling of 229890161 in words is "two hundred twenty-nine million, eight hundred ninety thousand, one hundred sixty-one".