135503321 has 2 divisors, whose sum is σ = 135503322. Its totient is φ = 135503320.

The previous prime is 135503293. The next prime is 135503339. The reversal of 135503321 is 123305531.

135503321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89113600 + 46389721 = 9440^2 + 6811^2 .

It is a cyclic number.

It is not a de Polignac number, because 135503321 - 2¹⁸ = 135241177 is a prime.

It is a super-2 number, since 2×135503321² = 36722300004058082, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (135503521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67751660 + 67751661.

It is an arithmetic number, because the mean of its divisors is an integer number (67751661).

Almost surely, 2^135503321 is an apocalyptic number.

It is an amenable number.

135503321 is a deficient number, since it is larger than the sum of its proper divisors (1).

135503321 is an equidigital number, since it uses as much as digits as its factorization.

135503321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1350, while the sum is 23.

The square root of 135503321 is about 11640.5893751133. The cubic root of 135503321 is about 513.6295243025.

Adding to 135503321 its reverse (123305531), we get a palindrome (258808852).

The spelling of 135503321 in words is "one hundred thirty-five million, five hundred three thousand, three hundred twenty-one".