420616501 has 2 divisors, whose sum is σ = 420616502. Its totient is φ = 420616500.

The previous prime is 420616477. The next prime is 420616523. The reversal of 420616501 is 105616024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 397045476 + 23571025 = 19926^2 + 4855^2 .

It is a cyclic number.

It is not a de Polignac number, because 420616501 - 2²⁷ = 286398773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420616531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210308250 + 210308251.

It is an arithmetic number, because the mean of its divisors is an integer number (210308251).

Almost surely, 2^420616501 is an apocalyptic number.

It is an amenable number.

420616501 is a deficient number, since it is larger than the sum of its proper divisors (1).

420616501 is an equidigital number, since it uses as much as digits as its factorization.

420616501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 420616501 is about 20508.9371006886. The cubic root of 420616501 is about 749.2534800052.

The spelling of 420616501 in words is "four hundred twenty million, six hundred sixteen thousand, five hundred one".