258978869 has 2 divisors, whose sum is σ = 258978870. Its totient is φ = 258978868.

The previous prime is 258978851. The next prime is 258978871. The reversal of 258978869 is 968879852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 251634769 + 7344100 = 15863^2 + 2710^2 .

It is a cyclic number.

It is not a de Polignac number, because 258978869 - 2¹² = 258974773 is a prime.

It is a super-2 number, since 2×258978869² = 134140109177038322, which contains 22 as substring.

Together with 258978871, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (258948869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129489434 + 129489435.

It is an arithmetic number, because the mean of its divisors is an integer number (129489435).

Almost surely, 2^258978869 is an apocalyptic number.

It is an amenable number.

258978869 is a deficient number, since it is larger than the sum of its proper divisors (1).

258978869 is an equidigital number, since it uses as much as digits as its factorization.

258978869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17418240, while the sum is 62.

The square root of 258978869 is about 16092.8204178137. The cubic root of 258978869 is about 637.4137729846.

The spelling of 258978869 in words is "two hundred fifty-eight million, nine hundred seventy-eight thousand, eight hundred sixty-nine".