201243689 has 2 divisors, whose sum is σ = 201243690. Its totient is φ = 201243688.

The previous prime is 201243677. The next prime is 201243701. The reversal of 201243689 is 986342102.

It is a balanced prime because it is at equal distance from previous prime (201243677) and next prime (201243701).

It can be written as a sum of positive squares in only one way, i.e., 110670400 + 90573289 = 10520^2 + 9517^2 .

It is a cyclic number.

It is not a de Polignac number, because 201243689 - 2¹² = 201239593 is a prime.

It is not a weakly prime, because it can be changed into another prime (201243659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100621844 + 100621845.

It is an arithmetic number, because the mean of its divisors is an integer number (100621845).

Almost surely, 2^201243689 is an apocalyptic number.

It is an amenable number.

201243689 is a deficient number, since it is larger than the sum of its proper divisors (1).

201243689 is an equidigital number, since it uses as much as digits as its factorization.

201243689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 201243689 is about 14186.0385238445. The cubic root of 201243689 is about 586.0132332081.

The spelling of 201243689 in words is "two hundred one million, two hundred forty-three thousand, six hundred eighty-nine".