420234691 has 2 divisors, whose sum is σ = 420234692. Its totient is φ = 420234690.

The previous prime is 420234671. The next prime is 420234751. The reversal of 420234691 is 196432024.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 420234691 - 2²⁷ = 286016963 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (420234631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210117345 + 210117346.

It is an arithmetic number, because the mean of its divisors is an integer number (210117346).

Almost surely, 2^420234691 is an apocalyptic number.

420234691 is a deficient number, since it is larger than the sum of its proper divisors (1).

420234691 is an equidigital number, since it uses as much as digits as its factorization.

420234691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 420234691 is about 20499.6266063555. The cubic root of 420234691 is about 749.0267025061.

The spelling of 420234691 in words is "four hundred twenty million, two hundred thirty-four thousand, six hundred ninety-one".