421266961 has 2 divisors, whose sum is σ = 421266962. Its totient is φ = 421266960.

The previous prime is 421266959. The next prime is 421266971. The reversal of 421266961 is 169662124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 419471361 + 1795600 = 20481^2 + 1340^2 .

It is a cyclic number.

It is not a de Polignac number, because 421266961 - 2¹ = 421266959 is a prime.

Together with 421266959, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 421266961.

It is not a weakly prime, because it can be changed into another prime (421266971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210633480 + 210633481.

It is an arithmetic number, because the mean of its divisors is an integer number (210633481).

Almost surely, 2^421266961 is an apocalyptic number.

It is an amenable number.

421266961 is a deficient number, since it is larger than the sum of its proper divisors (1).

421266961 is an equidigital number, since it uses as much as digits as its factorization.

421266961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 37.

The square root of 421266961 is about 20524.7889392315. The cubic root of 421266961 is about 749.6395073471.

The spelling of 421266961 in words is "four hundred twenty-one million, two hundred sixty-six thousand, nine hundred sixty-one".