258568649 has 2 divisors, whose sum is σ = 258568650. Its totient is φ = 258568648.

The previous prime is 258568643. The next prime is 258568679. The reversal of 258568649 is 946865852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 236544400 + 22024249 = 15380^2 + 4693^2 .

It is a cyclic number.

It is not a de Polignac number, because 258568649 - 2⁸ = 258568393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 258568649.

It is not a weakly prime, because it can be changed into another prime (258568643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129284324 + 129284325.

It is an arithmetic number, because the mean of its divisors is an integer number (129284325).

Almost surely, 2^258568649 is an apocalyptic number.

It is an amenable number.

258568649 is a deficient number, since it is larger than the sum of its proper divisors (1).

258568649 is an equidigital number, since it uses as much as digits as its factorization.

258568649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4147200, while the sum is 53.

The square root of 258568649 is about 16080.0699314400. The cubic root of 258568649 is about 637.0770427317.

The spelling of 258568649 in words is "two hundred fifty-eight million, five hundred sixty-eight thousand, six hundred forty-nine".