818355961 has 2 divisors, whose sum is σ = 818355962. Its totient is φ = 818355960.

The previous prime is 818355943. The next prime is 818355983. The reversal of 818355961 is 169553818.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 754051600 + 64304361 = 27460^2 + 8019^2 .

It is a cyclic number.

It is not a de Polignac number, because 818355961 - 2¹³ = 818347769 is a prime.

It is not a weakly prime, because it can be changed into another prime (818355761) 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 as a sum of consecutive naturals, namely, 409177980 + 409177981.

It is an arithmetic number, because the mean of its divisors is an integer number (409177981).

Almost surely, 2^818355961 is an apocalyptic number.

It is an amenable number.

818355961 is a deficient number, since it is larger than the sum of its proper divisors (1).

818355961 is an equidigital number, since it uses as much as digits as its factorization.

818355961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 259200, while the sum is 46.

The square root of 818355961 is about 28606.9215575532. The cubic root of 818355961 is about 935.3642135850.

The spelling of 818355961 in words is "eight hundred eighteen million, three hundred fifty-five thousand, nine hundred sixty-one".