1289461421 has 4 divisors (see below), whose sum is σ = 1290510144. Its totient is φ = 1288412700.

The previous prime is 1289461379. The next prime is 1289461447. The reversal of 1289461421 is 1241649821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1241649821 = 227 ⋅5469823.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1289461421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1289461451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 522515 + ... + 524976.

It is an arithmetic number, because the mean of its divisors is an integer number (322627536).

Almost surely, 2^1289461421 is an apocalyptic number.

It is an amenable number.

1289461421 is a deficient number, since it is larger than the sum of its proper divisors (1048723).

1289461421 is a wasteful number, since it uses less digits than its factorization.

1289461421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1048722.

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

The square root of 1289461421 is about 35909.0715697301. The cubic root of 1289461421 is about 1088.4357161829.

The spelling of 1289461421 in words is "one billion, two hundred eighty-nine million, four hundred sixty-one thousand, four hundred twenty-one".