239561869 has 2 divisors, whose sum is σ = 239561870. Its totient is φ = 239561868.

The previous prime is 239561863. The next prime is 239561879. The reversal of 239561869 is 968165932.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 212051844 + 27510025 = 14562^2 + 5245^2 .

It is a cyclic number.

It is not a de Polignac number, because 239561869 - 2¹¹ = 239559821 is a prime.

It is a super-2 number, since 2×239561869² = 114779778157546322, 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 (239561863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119780934 + 119780935.

It is an arithmetic number, because the mean of its divisors is an integer number (119780935).

Almost surely, 2^239561869 is an apocalyptic number.

It is an amenable number.

239561869 is a deficient number, since it is larger than the sum of its proper divisors (1).

239561869 is an equidigital number, since it uses as much as digits as its factorization.

239561869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 699840, while the sum is 49.

The square root of 239561869 is about 15477.7863081256. The cubic root of 239561869 is about 621.0681111509.

The spelling of 239561869 in words is "two hundred thirty-nine million, five hundred sixty-one thousand, eight hundred sixty-nine".