421316657 has 2 divisors, whose sum is σ = 421316658. Its totient is φ = 421316656.

The previous prime is 421316633. The next prime is 421316689. The reversal of 421316657 is 756613124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 421029361 + 287296 = 20519^2 + 536^2 .

It is a cyclic number.

It is not a de Polignac number, because 421316657 - 2²⁶ = 354207793 is a prime.

It is not a weakly prime, because it can be changed into another prime (421316057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210658328 + 210658329.

It is an arithmetic number, because the mean of its divisors is an integer number (210658329).

Almost surely, 2^421316657 is an apocalyptic number.

It is an amenable number.

421316657 is a deficient number, since it is larger than the sum of its proper divisors (1).

421316657 is an equidigital number, since it uses as much as digits as its factorization.

421316657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 35.

The square root of 421316657 is about 20525.9995371724. Note that the first 3 decimals coincide. The cubic root of 421316657 is about 749.6689840001.

The spelling of 421316657 in words is "four hundred twenty-one million, three hundred sixteen thousand, six hundred fifty-seven".