420522197 has 2 divisors, whose sum is σ = 420522198. Its totient is φ = 420522196.

The previous prime is 420522143. The next prime is 420522203. The reversal of 420522197 is 791225024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 410224516 + 10297681 = 20254^2 + 3209^2 .

It is a cyclic number.

It is not a de Polignac number, because 420522197 - 2¹⁶ = 420456661 is a prime.

It is equal to p_22370756 and since 420522197 and 22370756 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420522107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210261098 + 210261099.

It is an arithmetic number, because the mean of its divisors is an integer number (210261099).

Almost surely, 2^420522197 is an apocalyptic number.

It is an amenable number.

420522197 is a deficient number, since it is larger than the sum of its proper divisors (1).

420522197 is an equidigital number, since it uses as much as digits as its factorization.

420522197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 420522197 is about 20506.6378765511. The cubic root of 420522197 is about 749.1974805526.

The spelling of 420522197 in words is "four hundred twenty million, five hundred twenty-two thousand, one hundred ninety-seven".