918913 has 2 divisors, whose sum is σ = 918914. Its totient is φ = 918912.

The previous prime is 918899. The next prime is 918943. The reversal of 918913 is 319819.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 719104 + 199809 = 848^2 + 447^2 .

It is an emirp because it is prime and its reverse (319819) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-918913 is a prime.

It is a super-2 number, since 2×918913² = 1688802203138, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (918943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459456 + 459457.

It is an arithmetic number, because the mean of its divisors is an integer number (459457).

2⁹¹⁸⁹¹³ is an apocalyptic number.

It is an amenable number.

918913 is a deficient number, since it is larger than the sum of its proper divisors (1).

918913 is an equidigital number, since it uses as much as digits as its factorization.

918913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 31.

The square root of 918913 is about 958.5994992696. The cubic root of 918913 is about 97.2205630314.

The spelling of 918913 in words is "nine hundred eighteen thousand, nine hundred thirteen".