913239689 has 2 divisors, whose sum is σ = 913239690. Its totient is φ = 913239688.

The previous prime is 913239673. The next prime is 913239697. The reversal of 913239689 is 986932319.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 815388025 + 97851664 = 28555^2 + 9892^2 .

It is an emirp because it is prime and its reverse (986932319) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 913239689 - 2⁴ = 913239673 is a prime.

It is not a weakly prime, because it can be changed into another prime (913239629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 456619844 + 456619845.

It is an arithmetic number, because the mean of its divisors is an integer number (456619845).

Almost surely, 2^913239689 is an apocalyptic number.

It is an amenable number.

913239689 is a deficient number, since it is larger than the sum of its proper divisors (1).

913239689 is an equidigital number, since it uses as much as digits as its factorization.

913239689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 629856, while the sum is 50.

The square root of 913239689 is about 30219.8558732500. The cubic root of 913239689 is about 970.2007197905.

The spelling of 913239689 in words is "nine hundred thirteen million, two hundred thirty-nine thousand, six hundred eighty-nine".