258640111 has 2 divisors, whose sum is σ = 258640112. Its totient is φ = 258640110.

The previous prime is 258640021. The next prime is 258640127. The reversal of 258640111 is 111046852.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 258640111 - 2¹⁵ = 258607343 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 258640111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (258640171) 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, 129320055 + 129320056.

It is an arithmetic number, because the mean of its divisors is an integer number (129320056).

Almost surely, 2^258640111 is an apocalyptic number.

258640111 is a deficient number, since it is larger than the sum of its proper divisors (1).

258640111 is an equidigital number, since it uses as much as digits as its factorization.

258640111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 258640111 is about 16082.2918453807. The cubic root of 258640111 is about 637.1357281218.

Adding to 258640111 its reverse (111046852), we get a palindrome (369686963).

The spelling of 258640111 in words is "two hundred fifty-eight million, six hundred forty thousand, one hundred eleven".