258919981 has 2 divisors, whose sum is σ = 258919982. Its totient is φ = 258919980.

The previous prime is 258919943. The next prime is 258920023. The reversal of 258919981 is 189919852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 182007081 + 76912900 = 13491^2 + 8770^2 .

It is a cyclic number.

It is not a de Polignac number, because 258919981 - 2¹³ = 258911789 is a prime.

It is a super-2 number, since 2×258919981² = 134079113122080722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (258919181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129459990 + 129459991.

It is an arithmetic number, because the mean of its divisors is an integer number (129459991).

Almost surely, 2^258919981 is an apocalyptic number.

It is an amenable number.

258919981 is a deficient number, since it is larger than the sum of its proper divisors (1).

258919981 is an equidigital number, since it uses as much as digits as its factorization.

258919981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 52.

The square root of 258919981 is about 16090.9906780161. The cubic root of 258919981 is about 637.3654564716.

The spelling of 258919981 in words is "two hundred fifty-eight million, nine hundred nineteen thousand, nine hundred eighty-one".