135621533 has 2 divisors, whose sum is σ = 135621534. Its totient is φ = 135621532.

The previous prime is 135621511. The next prime is 135621553. The reversal of 135621533 is 335126531.

135621533 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., 126270169 + 9351364 = 11237^2 + 3058^2 .

It is a cyclic number.

It is not a de Polignac number, because 135621533 - 2¹² = 135617437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 135621496 and 135621505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135621503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67810766 + 67810767.

It is an arithmetic number, because the mean of its divisors is an integer number (67810767).

Almost surely, 2^135621533 is an apocalyptic number.

It is an amenable number.

135621533 is a deficient number, since it is larger than the sum of its proper divisors (1).

135621533 is an equidigital number, since it uses as much as digits as its factorization.

135621533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8100, while the sum is 29.

The square root of 135621533 is about 11645.6658461421. The cubic root of 135621533 is about 513.7788429688.

The spelling of 135621533 in words is "one hundred thirty-five million, six hundred twenty-one thousand, five hundred thirty-three".