420505115491 has 2 divisors, whose sum is σ = 420505115492. Its totient is φ = 420505115490.

The previous prime is 420505115479. The next prime is 420505115509. The reversal of 420505115491 is 194511505024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 420505115491 - 2⁹ = 420505114979 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 420505115491.

It is not a weakly prime, because it can be changed into another prime (420515115491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210252557745 + 210252557746.

It is an arithmetic number, because the mean of its divisors is an integer number (210252557746).

Almost surely, 2^420505115491 is an apocalyptic number.

420505115491 is a deficient number, since it is larger than the sum of its proper divisors (1).

420505115491 is an equidigital number, since it uses as much as digits as its factorization.

420505115491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36000, while the sum is 37.

The spelling of 420505115491 in words is "four hundred twenty billion, five hundred five million, one hundred fifteen thousand, four hundred ninety-one".