418890961 has 2 divisors, whose sum is σ = 418890962. Its totient is φ = 418890960.

The previous prime is 418890947. The next prime is 418890991. The reversal of 418890961 is 169098814.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 408848400 + 10042561 = 20220^2 + 3169^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-418890961 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (418890991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 209445480 + 209445481.

It is an arithmetic number, because the mean of its divisors is an integer number (209445481).

Almost surely, 2^418890961 is an apocalyptic number.

It is an amenable number.

418890961 is a deficient number, since it is larger than the sum of its proper divisors (1).

418890961 is an equidigital number, since it uses as much as digits as its factorization.

418890961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 46.

The square root of 418890961 is about 20466.8258652875. The cubic root of 418890961 is about 748.2274948600.

The spelling of 418890961 in words is "four hundred eighteen million, eight hundred ninety thousand, nine hundred sixty-one".