421434691 has 2 divisors, whose sum is σ = 421434692. Its totient is φ = 421434690.

The previous prime is 421434659. The next prime is 421434719. The reversal of 421434691 is 196434124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421434691 - 2⁵ = 421434659 is a prime.

It is not a weakly prime, because it can be changed into another prime (421414691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210717345 + 210717346.

It is an arithmetic number, because the mean of its divisors is an integer number (210717346).

Almost surely, 2^421434691 is an apocalyptic number.

421434691 is a deficient number, since it is larger than the sum of its proper divisors (1).

421434691 is an equidigital number, since it uses as much as digits as its factorization.

421434691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 34.

The square root of 421434691 is about 20528.8745673015. The cubic root of 421434691 is about 749.7389853205.

The spelling of 421434691 in words is "four hundred twenty-one million, four hundred thirty-four thousand, six hundred ninety-one".