258671981 has 2 divisors, whose sum is σ = 258671982. Its totient is φ = 258671980.

The previous prime is 258671953. The next prime is 258672019. The reversal of 258671981 is 189176852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167469481 + 91202500 = 12941^2 + 9550^2 .

It is a cyclic number.

It is not a de Polignac number, because 258671981 - 2¹⁰ = 258670957 is a prime.

It is a super-2 number, since 2×258671981² = 133822387508928722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (258671951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129335990 + 129335991.

It is an arithmetic number, because the mean of its divisors is an integer number (129335991).

Almost surely, 2^258671981 is an apocalyptic number.

It is an amenable number.

258671981 is a deficient number, since it is larger than the sum of its proper divisors (1).

258671981 is an equidigital number, since it uses as much as digits as its factorization.

258671981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 47.

The square root of 258671981 is about 16083.2826562241. The cubic root of 258671981 is about 637.1618966353.

The spelling of 258671981 in words is "two hundred fifty-eight million, six hundred seventy-one thousand, nine hundred eighty-one".