258694921 has 2 divisors, whose sum is σ = 258694922. Its totient is φ = 258694920.

The previous prime is 258694913. The next prime is 258694927. The reversal of 258694921 is 129496852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190136521 + 68558400 = 13789^2 + 8280^2 .

It is a cyclic number.

It is not a de Polignac number, because 258694921 - 2³ = 258694913 is a prime.

It is not a weakly prime, because it can be changed into another prime (258694927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129347460 + 129347461.

It is an arithmetic number, because the mean of its divisors is an integer number (129347461).

Almost surely, 2^258694921 is an apocalyptic number.

It is an amenable number.

258694921 is a deficient number, since it is larger than the sum of its proper divisors (1).

258694921 is an equidigital number, since it uses as much as digits as its factorization.

258694921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 46.

The square root of 258694921 is about 16083.9958032822. The cubic root of 258694921 is about 637.1807313796.

The spelling of 258694921 in words is "two hundred fifty-eight million, six hundred ninety-four thousand, nine hundred twenty-one".