258491969 has 2 divisors, whose sum is σ = 258491970. Its totient is φ = 258491968.

The previous prime is 258491939. The next prime is 258491977. The reversal of 258491969 is 969194852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130530625 + 127961344 = 11425^2 + 11312^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-258491969 is a prime.

It is a super-2 number, since 2×258491969² = 133636196074993922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 258491969.

It is not a weakly prime, because it can be changed into another prime (258491939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129245984 + 129245985.

It is an arithmetic number, because the mean of its divisors is an integer number (129245985).

Almost surely, 2^258491969 is an apocalyptic number.

It is an amenable number.

258491969 is a deficient number, since it is larger than the sum of its proper divisors (1).

258491969 is an equidigital number, since it uses as much as digits as its factorization.

258491969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1399680, while the sum is 53.

The square root of 258491969 is about 16077.6854366541. The cubic root of 258491969 is about 637.0140602348.

The spelling of 258491969 in words is "two hundred fifty-eight million, four hundred ninety-one thousand, nine hundred sixty-nine".