421951697 has 2 divisors, whose sum is σ = 421951698. Its totient is φ = 421951696.

The previous prime is 421951687. The next prime is 421951703. The reversal of 421951697 is 796159124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 236882881 + 185068816 = 15391^2 + 13604^2 .

It is a cyclic number.

It is not a de Polignac number, because 421951697 - 2¹⁰ = 421950673 is a prime.

It is not a weakly prime, because it can be changed into another prime (421951667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210975848 + 210975849.

It is an arithmetic number, because the mean of its divisors is an integer number (210975849).

Almost surely, 2^421951697 is an apocalyptic number.

It is an amenable number.

421951697 is a deficient number, since it is larger than the sum of its proper divisors (1).

421951697 is an equidigital number, since it uses as much as digits as its factorization.

421951697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 44.

The square root of 421951697 is about 20541.4628739046. The cubic root of 421951697 is about 750.0454473201.

The spelling of 421951697 in words is "four hundred twenty-one million, nine hundred fifty-one thousand, six hundred ninety-seven".