210135689 has 2 divisors, whose sum is σ = 210135690. Its totient is φ = 210135688.

The previous prime is 210135671. The next prime is 210135703. The reversal of 210135689 is 986531012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 207936400 + 2199289 = 14420^2 + 1483^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210135689 is a prime.

It is not a weakly prime, because it can be changed into another prime (210155689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105067844 + 105067845.

It is an arithmetic number, because the mean of its divisors is an integer number (105067845).

Almost surely, 2^210135689 is an apocalyptic number.

It is an amenable number.

210135689 is a deficient number, since it is larger than the sum of its proper divisors (1).

210135689 is an equidigital number, since it uses as much as digits as its factorization.

210135689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 210135689 is about 14496.0577054591. The cubic root of 210135689 is about 594.5201875270.

The spelling of 210135689 in words is "two hundred ten million, one hundred thirty-five thousand, six hundred eighty-nine".