918256321 has 2 divisors, whose sum is σ = 918256322. Its totient is φ = 918256320.

The previous prime is 918256291. The next prime is 918256327. The reversal of 918256321 is 123652819.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 636855696 + 281400625 = 25236^2 + 16775^2 .

It is a cyclic number.

It is not a de Polignac number, because 918256321 - 2¹¹ = 918254273 is a prime.

It is not a weakly prime, because it can be changed into another prime (918256327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459128160 + 459128161.

It is an arithmetic number, because the mean of its divisors is an integer number (459128161).

Almost surely, 2^918256321 is an apocalyptic number.

It is an amenable number.

918256321 is a deficient number, since it is larger than the sum of its proper divisors (1).

918256321 is an equidigital number, since it uses as much as digits as its factorization.

918256321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 37.

The square root of 918256321 is about 30302.7444466669. The cubic root of 918256321 is about 971.9739873618.

The spelling of 918256321 in words is "nine hundred eighteen million, two hundred fifty-six thousand, three hundred twenty-one".