421453961 has 2 divisors, whose sum is σ = 421453962. Its totient is φ = 421453960.

The previous prime is 421453937. The next prime is 421453973. The reversal of 421453961 is 169354124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 294328336 + 127125625 = 17156^2 + 11275^2 .

It is a cyclic number.

It is not a de Polignac number, because 421453961 - 2²² = 417259657 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (421453061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210726980 + 210726981.

It is an arithmetic number, because the mean of its divisors is an integer number (210726981).

Almost surely, 2^421453961 is an apocalyptic number.

It is an amenable number.

421453961 is a deficient number, since it is larger than the sum of its proper divisors (1).

421453961 is an equidigital number, since it uses as much as digits as its factorization.

421453961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 35.

The square root of 421453961 is about 20529.3439008654. The cubic root of 421453961 is about 749.7504123580.

The spelling of 421453961 in words is "four hundred twenty-one million, four hundred fifty-three thousand, nine hundred sixty-one".