268959989 has 2 divisors, whose sum is σ = 268959990. Its totient is φ = 268959988.

The previous prime is 268959983. The next prime is 268960019. The reversal of 268959989 is 989959862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 267159025 + 1800964 = 16345^2 + 1342^2 .

It is a cyclic number.

It is not a de Polignac number, because 268959989 - 2⁴ = 268959973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268959983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134479994 + 134479995.

It is an arithmetic number, because the mean of its divisors is an integer number (134479995).

Almost surely, 2^268959989 is an apocalyptic number.

It is an amenable number.

268959989 is a deficient number, since it is larger than the sum of its proper divisors (1).

268959989 is an equidigital number, since it uses as much as digits as its factorization.

268959989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25194240, while the sum is 65.

The square root of 268959989 is about 16399.9996646341. Note that the first 3 decimals coincide. The cubic root of 268959989 is about 645.4994741041.

The spelling of 268959989 in words is "two hundred sixty-eight million, nine hundred fifty-nine thousand, nine hundred eighty-nine".