918268649 has 2 divisors, whose sum is σ = 918268650. Its totient is φ = 918268648.

The previous prime is 918268633. The next prime is 918268699. The reversal of 918268649 is 946862819.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 872611600 + 45657049 = 29540^2 + 6757^2 .

It is a cyclic number.

It is not a de Polignac number, because 918268649 - 2⁴ = 918268633 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 918268649.

It is not a weakly prime, because it can be changed into another prime (918268609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459134324 + 459134325.

It is an arithmetic number, because the mean of its divisors is an integer number (459134325).

Almost surely, 2^918268649 is an apocalyptic number.

It is an amenable number.

918268649 is a deficient number, since it is larger than the sum of its proper divisors (1).

918268649 is an equidigital number, since it uses as much as digits as its factorization.

918268649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1492992, while the sum is 53.

The square root of 918268649 is about 30302.9478599030. The cubic root of 918268649 is about 971.9783370702.

The spelling of 918268649 in words is "nine hundred eighteen million, two hundred sixty-eight thousand, six hundred forty-nine".