918391001 has 4 divisors (see below), whose sum is σ = 1001881104. Its totient is φ = 834900900.

The previous prime is 918390971. The next prime is 918391039. The reversal of 918391001 is 100193819.

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 a de Polignac number, because none of the positive numbers 2^k-918391001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (918391091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41745035 + ... + 41745056.

It is an arithmetic number, because the mean of its divisors is an integer number (250470276).

Almost surely, 2^918391001 is an apocalyptic number.

It is an amenable number.

918391001 is a deficient number, since it is larger than the sum of its proper divisors (83490103).

918391001 is a wasteful number, since it uses less digits than its factorization.

918391001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83490102.

The product of its (nonzero) digits is 1944, while the sum is 32.

The square root of 918391001 is about 30304.9666061522. The cubic root of 918391001 is about 972.0215046160.

The spelling of 918391001 in words is "nine hundred eighteen million, three hundred ninety-one thousand, one".