135515531 has 2 divisors, whose sum is σ = 135515532. Its totient is φ = 135515530.

The previous prime is 135515503. The next prime is 135515533.

135515531 is nontrivially palindromic in base 10.

It is a strong prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 135515531 - 2¹⁰ = 135514507 is a prime.

It is a super-2 number, since 2×135515531² = 36728918284423922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 135515533, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 135515494 and 135515503.

It is not a weakly prime, because it can be changed into another prime (135515533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67757765 + 67757766.

It is an arithmetic number, because the mean of its divisors is an integer number (67757766).

Almost surely, 2^135515531 is an apocalyptic number.

135515531 is a deficient number, since it is larger than the sum of its proper divisors (1).

135515531 is an equidigital number, since it uses as much as digits as its factorization.

135515531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5625, while the sum is 29.

The square root of 135515531 is about 11641.1138212802. The cubic root of 135515531 is about 513.6449512999.

The spelling of 135515531 in words is "one hundred thirty-five million, five hundred fifteen thousand, five hundred thirty-one".