258239869 has 2 divisors, whose sum is σ = 258239870. Its totient is φ = 258239868.

The previous prime is 258239801. The next prime is 258239879. The reversal of 258239869 is 968932852.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 254817369 + 3422500 = 15963^2 + 1850^2 .

It is a cyclic number.

It is not a de Polignac number, because 258239869 - 2⁹ = 258239357 is a prime.

It is a super-2 number, since 2×258239869² = 133375659882274322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (258239879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129119934 + 129119935.

It is an arithmetic number, because the mean of its divisors is an integer number (129119935).

Almost surely, 2^258239869 is an apocalyptic number.

It is an amenable number.

258239869 is a deficient number, since it is larger than the sum of its proper divisors (1).

258239869 is an equidigital number, since it uses as much as digits as its factorization.

258239869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1866240, while the sum is 52.

The square root of 258239869 is about 16069.8434653235. The cubic root of 258239869 is about 636.8069055338.

The spelling of 258239869 in words is "two hundred fifty-eight million, two hundred thirty-nine thousand, eight hundred sixty-nine".