1421989501 has 2 divisors, whose sum is σ = 1421989502. Its totient is φ = 1421989500.

The previous prime is 1421989487. The next prime is 1421989529. The reversal of 1421989501 is 1059891241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1421365401 + 624100 = 37701^2 + 790^2 .

It is a cyclic number.

It is not a de Polignac number, because 1421989501 - 2⁹ = 1421988989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1421989001) 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, 710994750 + 710994751.

It is an arithmetic number, because the mean of its divisors is an integer number (710994751).

Almost surely, 2^1421989501 is an apocalyptic number.

It is an amenable number.

1421989501 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421989501 is an equidigital number, since it uses as much as digits as its factorization.

1421989501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 40.

The square root of 1421989501 is about 37709.2760604072. The cubic root of 1421989501 is about 1124.5155447603.

The spelling of 1421989501 in words is "one billion, four hundred twenty-one million, nine hundred eighty-nine thousand, five hundred one".