135602581 has 2 divisors, whose sum is σ = 135602582. Its totient is φ = 135602580.

The previous prime is 135602543. The next prime is 135602603. The reversal of 135602581 is 185206531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124679556 + 10923025 = 11166^2 + 3305^2 .

It is a cyclic number.

It is not a de Polignac number, because 135602581 - 2¹¹ = 135600533 is a prime.

It is a super-2 number, since 2×135602581² = 36776119947723122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135600581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67801290 + 67801291.

It is an arithmetic number, because the mean of its divisors is an integer number (67801291).

Almost surely, 2^135602581 is an apocalyptic number.

It is an amenable number.

135602581 is a deficient number, since it is larger than the sum of its proper divisors (1).

135602581 is an equidigital number, since it uses as much as digits as its factorization.

135602581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 135602581 is about 11644.8521244368. The cubic root of 135602581 is about 513.7549097235.

The spelling of 135602581 in words is "one hundred thirty-five million, six hundred two thousand, five hundred eighty-one".