420144997 has 2 divisors, whose sum is σ = 420144998. Its totient is φ = 420144996.

The previous prime is 420144971. The next prime is 420145009. The reversal of 420144997 is 799441024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 416200801 + 3944196 = 20401^2 + 1986^2 .

It is a cyclic number.

It is not a de Polignac number, because 420144997 - 2¹⁵ = 420112229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420244997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210072498 + 210072499.

It is an arithmetic number, because the mean of its divisors is an integer number (210072499).

Almost surely, 2^420144997 is an apocalyptic number.

It is an amenable number.

420144997 is a deficient number, since it is larger than the sum of its proper divisors (1).

420144997 is an equidigital number, since it uses as much as digits as its factorization.

420144997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 420144997 is about 20497.4387912246. The cubic root of 420144997 is about 748.9734084913.

The spelling of 420144997 in words is "four hundred twenty million, one hundred forty-four thousand, nine hundred ninety-seven".