420990671 has 2 divisors, whose sum is σ = 420990672. Its totient is φ = 420990670.

The previous prime is 420990667. The next prime is 420990677. The reversal of 420990671 is 176099024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 420990671 - 2² = 420990667 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420990677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210495335 + 210495336.

It is an arithmetic number, because the mean of its divisors is an integer number (210495336).

Almost surely, 2^420990671 is an apocalyptic number.

420990671 is a deficient number, since it is larger than the sum of its proper divisors (1).

420990671 is an equidigital number, since it uses as much as digits as its factorization.

420990671 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 420990671 is about 20518.0571936039. The cubic root of 420990671 is about 749.4755865914.

The spelling of 420990671 in words is "four hundred twenty million, nine hundred ninety thousand, six hundred seventy-one".