418890991 has 2 divisors, whose sum is σ = 418890992. Its totient is φ = 418890990.

The previous prime is 418890961. The next prime is 418891007. The reversal of 418890991 is 199098814.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 418890991 - 2¹³ = 418882799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (418890961) 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, 209445495 + 209445496.

It is an arithmetic number, because the mean of its divisors is an integer number (209445496).

Almost surely, 2^418890991 is an apocalyptic number.

418890991 is a deficient number, since it is larger than the sum of its proper divisors (1).

418890991 is an equidigital number, since it uses as much as digits as its factorization.

418890991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 49.

The square root of 418890991 is about 20466.8265981808. The cubic root of 418890991 is about 748.2275127221.

The spelling of 418890991 in words is "four hundred eighteen million, eight hundred ninety thousand, nine hundred ninety-one".