15421000549 has 2 divisors, whose sum is σ = 15421000550. Its totient is φ = 15421000548.

The previous prime is 15421000523. The next prime is 15421000579. The reversal of 15421000549 is 94500012451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8534988225 + 6886012324 = 92385^2 + 82982^2 .

It is a cyclic number.

It is not a de Polignac number, because 15421000549 - 2⁹ = 15421000037 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15421000549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15421000519) 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 as a sum of consecutive naturals, namely, 7710500274 + 7710500275.

It is an arithmetic number, because the mean of its divisors is an integer number (7710500275).

Almost surely, 2^15421000549 is an apocalyptic number.

It is an amenable number.

15421000549 is a deficient number, since it is larger than the sum of its proper divisors (1).

15421000549 is an equidigital number, since it uses as much as digits as its factorization.

15421000549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 31.

The spelling of 15421000549 in words is "fifteen billion, four hundred twenty-one million, five hundred forty-nine", and thus it is an aban number.