1421544389 has 2 divisors, whose sum is σ = 1421544390. Its totient is φ = 1421544388.

The previous prime is 1421544373. The next prime is 1421544433. The reversal of 1421544389 is 9834451241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 753063364 + 668481025 = 27442^2 + 25855^2 .

It is a cyclic number.

It is not a de Polignac number, because 1421544389 - 2⁴ = 1421544373 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1421544689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710772194 + 710772195.

It is an arithmetic number, because the mean of its divisors is an integer number (710772195).

Almost surely, 2^1421544389 is an apocalyptic number.

It is an amenable number.

1421544389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421544389 is an equidigital number, since it uses as much as digits as its factorization.

1421544389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138240, while the sum is 41.

The square root of 1421544389 is about 37703.3737084627. The cubic root of 1421544389 is about 1124.3982003406.

The spelling of 1421544389 in words is "one billion, four hundred twenty-one million, five hundred forty-four thousand, three hundred eighty-nine".