918601391 has 2 divisors, whose sum is σ = 918601392. Its totient is φ = 918601390.

The previous prime is 918601357. The next prime is 918601399. The reversal of 918601391 is 193106819.

It is a strong prime.

It is an emirp because it is prime and its reverse (193106819) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-918601391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (918601399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459300695 + 459300696.

It is an arithmetic number, because the mean of its divisors is an integer number (459300696).

Almost surely, 2^918601391 is an apocalyptic number.

918601391 is a deficient number, since it is larger than the sum of its proper divisors (1).

918601391 is an equidigital number, since it uses as much as digits as its factorization.

918601391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 918601391 is about 30308.4376205703. The cubic root of 918601391 is about 972.0957242712.

The spelling of 918601391 in words is "nine hundred eighteen million, six hundred one thousand, three hundred ninety-one".