257216111 has 2 divisors, whose sum is σ = 257216112. Its totient is φ = 257216110.

The previous prime is 257216093. The next prime is 257216117. The reversal of 257216111 is 111612752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257216111 - 2¹⁰ = 257215087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257216117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128608055 + 128608056.

It is an arithmetic number, because the mean of its divisors is an integer number (128608056).

Almost surely, 2^257216111 is an apocalyptic number.

257216111 is a deficient number, since it is larger than the sum of its proper divisors (1).

257216111 is an equidigital number, since it uses as much as digits as its factorization.

257216111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 840, while the sum is 26.

The square root of 257216111 is about 16037.9584423953. The cubic root of 257216111 is about 635.9642786459.

Adding to 257216111 its reverse (111612752), we get a palindrome (368828863).

The spelling of 257216111 in words is "two hundred fifty-seven million, two hundred sixteen thousand, one hundred eleven".