918641309 has 4 divisors (see below), whose sum is σ = 930269760. Its totient is φ = 907012860.

The previous prime is 918641287. The next prime is 918641329. The reversal of 918641309 is 903146819.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 918641309 - 2²⁰ = 917592733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (918641329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5814107 + ... + 5814264.

It is an arithmetic number, because the mean of its divisors is an integer number (232567440).

Almost surely, 2^918641309 is an apocalyptic number.

It is an amenable number.

918641309 is a deficient number, since it is larger than the sum of its proper divisors (11628451).

918641309 is a wasteful number, since it uses less digits than its factorization.

918641309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11628450.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 918641309 is about 30309.0961429073. The cubic root of 918641309 is about 972.1098049360.

The spelling of 918641309 in words is "nine hundred eighteen million, six hundred forty-one thousand, three hundred nine".