258306989 has 2 divisors, whose sum is σ = 258306990. Its totient is φ = 258306988.

The previous prime is 258306967. The next prime is 258307009. The reversal of 258306989 is 989603852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 151536100 + 106770889 = 12310^2 + 10333^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-258306989 is a prime.

It is a super-2 number, since 2×258306989² = 133445001132492242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (258306949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129153494 + 129153495.

It is an arithmetic number, because the mean of its divisors is an integer number (129153495).

Almost surely, 2^258306989 is an apocalyptic number.

It is an amenable number.

258306989 is a deficient number, since it is larger than the sum of its proper divisors (1).

258306989 is an equidigital number, since it uses as much as digits as its factorization.

258306989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 933120, while the sum is 50.

The square root of 258306989 is about 16071.9317133940. The cubic root of 258306989 is about 636.8620723019.

The spelling of 258306989 in words is "two hundred fifty-eight million, three hundred six thousand, nine hundred eighty-nine".