258618869 has 2 divisors, whose sum is σ = 258618870. Its totient is φ = 258618868.

The previous prime is 258618859. The next prime is 258618881. The reversal of 258618869 is 968816852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 242175844 + 16443025 = 15562^2 + 4055^2 .

It is a cyclic number.

It is not a de Polignac number, because 258618869 - 2²⁴ = 241841653 is a prime.

It is a super-2 number, since 2×258618869² = 133767438805678322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 258618869.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (258618859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129309434 + 129309435.

It is an arithmetic number, because the mean of its divisors is an integer number (129309435).

Almost surely, 2^258618869 is an apocalyptic number.

It is an amenable number.

258618869 is a deficient number, since it is larger than the sum of its proper divisors (1).

258618869 is an equidigital number, since it uses as much as digits as its factorization.

258618869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1658880, while the sum is 53.

The square root of 258618869 is about 16081.6314159976. The cubic root of 258618869 is about 637.1182850841.

The spelling of 258618869 in words is "two hundred fifty-eight million, six hundred eighteen thousand, eight hundred sixty-nine".