258921287 has 2 divisors, whose sum is σ = 258921288. Its totient is φ = 258921286.

The previous prime is 258921283. The next prime is 258921293. The reversal of 258921287 is 782129852.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 258921287 - 2² = 258921283 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (258921283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129460643 + 129460644.

It is an arithmetic number, because the mean of its divisors is an integer number (129460644).

Almost surely, 2^258921287 is an apocalyptic number.

258921287 is a deficient number, since it is larger than the sum of its proper divisors (1).

258921287 is an equidigital number, since it uses as much as digits as its factorization.

258921287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 44.

The square root of 258921287 is about 16091.0312596800. The cubic root of 258921287 is about 637.3665280998.

The spelling of 258921287 in words is "two hundred fifty-eight million, nine hundred twenty-one thousand, two hundred eighty-seven".