135521003 has 2 divisors, whose sum is σ = 135521004. Its totient is φ = 135521002.

The previous prime is 135520981. The next prime is 135521011. The reversal of 135521003 is 300125531.

135521003 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 is a cyclic number.

It is not a de Polignac number, because 135521003 - 2¹² = 135516907 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (135521063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67760501 + 67760502.

It is an arithmetic number, because the mean of its divisors is an integer number (67760502).

Almost surely, 2^135521003 is an apocalyptic number.

135521003 is a deficient number, since it is larger than the sum of its proper divisors (1).

135521003 is an equidigital number, since it uses as much as digits as its factorization.

135521003 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 135521003 is about 11641.3488479643. The cubic root of 135521003 is about 513.6518647199.

Adding to 135521003 its reverse (300125531), we get a palindrome (435646534).

The spelling of 135521003 in words is "one hundred thirty-five million, five hundred twenty-one thousand, three".