913639 has 2 divisors, whose sum is σ = 913640. Its totient is φ = 913638.

The previous prime is 913637. The next prime is 913687. The reversal of 913639 is 936319.

It is a weak prime.

It is an emirp because it is prime and its reverse (936319) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 913639 - 2¹ = 913637 is a prime.

Together with 913637, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 913639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (913637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 456819 + 456820.

It is an arithmetic number, because the mean of its divisors is an integer number (456820).

2⁹¹³⁶³⁹ is an apocalyptic number.

913639 is a deficient number, since it is larger than the sum of its proper divisors (1).

913639 is an equidigital number, since it uses as much as digits as its factorization.

913639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4374, while the sum is 31.

The square root of 913639 is about 955.8446526502. The cubic root of 913639 is about 97.0342104859.

The spelling of 913639 in words is "nine hundred thirteen thousand, six hundred thirty-nine".