418129391 has 2 divisors, whose sum is σ = 418129392. Its totient is φ = 418129390.

The previous prime is 418129307. The next prime is 418129469. The reversal of 418129391 is 193921814.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-418129391 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (418122391) 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, 209064695 + 209064696.

It is an arithmetic number, because the mean of its divisors is an integer number (209064696).

Almost surely, 2^418129391 is an apocalyptic number.

418129391 is a deficient number, since it is larger than the sum of its proper divisors (1).

418129391 is an equidigital number, since it uses as much as digits as its factorization.

418129391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 38.

The square root of 418129391 is about 20448.2124157590. The cubic root of 418129391 is about 747.7737783061.

The spelling of 418129391 in words is "four hundred eighteen million, one hundred twenty-nine thousand, three hundred ninety-one".