420201515331491 has 2 divisors, whose sum is σ = 420201515331492. Its totient is φ = 420201515331490.

The previous prime is 420201515331401. The next prime is 420201515331523. The reversal of 420201515331491 is 194133515102024.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420201515331491 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (420201515331401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210100757665745 + 210100757665746.

It is an arithmetic number, because the mean of its divisors is an integer number (210100757665746).

Almost surely, 2^{420201515331491} is an apocalyptic number.

420201515331491 is a deficient number, since it is larger than the sum of its proper divisors (1).

420201515331491 is an equidigital number, since it uses as much as digits as its factorization.

420201515331491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 41.

The spelling of 420201515331491 in words is "four hundred twenty trillion, two hundred one billion, five hundred fifteen million, three hundred thirty-one thousand, four hundred ninety-one".