420271669 has 2 divisors, whose sum is σ = 420271670. Its totient is φ = 420271668.

The previous prime is 420271661. The next prime is 420271679. The reversal of 420271669 is 966172024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 235991044 + 184280625 = 15362^2 + 13575^2 .

It is a cyclic number.

It is not a de Polignac number, because 420271669 - 2³ = 420271661 is a prime.

It is a super-2 number, since 2×420271669² = 353256551528091122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420271661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210135834 + 210135835.

It is an arithmetic number, because the mean of its divisors is an integer number (210135835).

Almost surely, 2^420271669 is an apocalyptic number.

It is an amenable number.

420271669 is a deficient number, since it is larger than the sum of its proper divisors (1).

420271669 is an equidigital number, since it uses as much as digits as its factorization.

420271669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 420271669 is about 20500.5285053825. The cubic root of 420271669 is about 749.0486717355.

The spelling of 420271669 in words is "four hundred twenty million, two hundred seventy-one thousand, six hundred sixty-nine".