1428421961 has 2 divisors, whose sum is σ = 1428421962. Its totient is φ = 1428421960.

The previous prime is 1428421927. The next prime is 1428421987. The reversal of 1428421961 is 1691248241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1150566400 + 277855561 = 33920^2 + 16669^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1428421961 is a prime.

It is not a weakly prime, because it can be changed into another prime (1428421901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 714210980 + 714210981.

It is an arithmetic number, because the mean of its divisors is an integer number (714210981).

Almost surely, 2^1428421961 is an apocalyptic number.

It is an amenable number.

1428421961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1428421961 is an equidigital number, since it uses as much as digits as its factorization.

1428421961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 38.

The square root of 1428421961 is about 37794.4699790856. The cubic root of 1428421961 is about 1126.2086003154.

The spelling of 1428421961 in words is "one billion, four hundred twenty-eight million, four hundred twenty-one thousand, nine hundred sixty-one".