1550728369 has 2 divisors, whose sum is σ = 1550728370. Its totient is φ = 1550728368.

The previous prime is 1550728357. The next prime is 1550728391. The reversal of 1550728369 is 9638270551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1128960000 + 421768369 = 33600^2 + 20537^2 .

It is a cyclic number.

It is not a de Polignac number, because 1550728369 - 2⁵ = 1550728337 is a prime.

It is a super-5 number, since 5×1550728369⁵ (a number of 47 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (1550728169) 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, 775364184 + 775364185.

It is an arithmetic number, because the mean of its divisors is an integer number (775364185).

Almost surely, 2^1550728369 is an apocalyptic number.

It is an amenable number.

1550728369 is a deficient number, since it is larger than the sum of its proper divisors (1).

1550728369 is an equidigital number, since it uses as much as digits as its factorization.

1550728369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 453600, while the sum is 46.

The square root of 1550728369 is about 39379.2885791503. The cubic root of 1550728369 is about 1157.4757757480.

The spelling of 1550728369 in words is "one billion, five hundred fifty million, seven hundred twenty-eight thousand, three hundred sixty-nine".