918691121 has 2 divisors, whose sum is σ = 918691122. Its totient is φ = 918691120.

The previous prime is 918691063. The next prime is 918691133. The reversal of 918691121 is 121196819.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 496799521 + 421891600 = 22289^2 + 20540^2 .

It is an emirp because it is prime and its reverse (121196819) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 918691121 - 2¹⁸ = 918428977 is a prime.

It is not a weakly prime, because it can be changed into another prime (918691181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459345560 + 459345561.

It is an arithmetic number, because the mean of its divisors is an integer number (459345561).

Almost surely, 2^918691121 is an apocalyptic number.

It is an amenable number.

918691121 is a deficient number, since it is larger than the sum of its proper divisors (1).

918691121 is an equidigital number, since it uses as much as digits as its factorization.

918691121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 38.

The square root of 918691121 is about 30309.9178652797. The cubic root of 918691121 is about 972.1273750358.

The spelling of 918691121 in words is "nine hundred eighteen million, six hundred ninety-one thousand, one hundred twenty-one".