1534621321 has 2 divisors, whose sum is σ = 1534621322. Its totient is φ = 1534621320.

The previous prime is 1534621271. The next prime is 1534621327. The reversal of 1534621321 is 1231264351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1252381321 + 282240000 = 35389^2 + 16800^2 .

It is an emirp because it is prime and its reverse (1231264351) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1534621321 - 2⁹ = 1534620809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1534621321.

It is not a weakly prime, because it can be changed into another prime (1534621327) 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, 767310660 + 767310661.

It is an arithmetic number, because the mean of its divisors is an integer number (767310661).

Almost surely, 2^1534621321 is an apocalyptic number.

It is an amenable number.

1534621321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1534621321 is an equidigital number, since it uses as much as digits as its factorization.

1534621321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 28.

The square root of 1534621321 is about 39174.2430813921. The cubic root of 1534621321 is about 1153.4543447171.

Adding to 1534621321 its reverse (1231264351), we get a palindrome (2765885672).

The spelling of 1534621321 in words is "one billion, five hundred thirty-four million, six hundred twenty-one thousand, three hundred twenty-one".