169135531 has 2 divisors, whose sum is σ = 169135532. Its totient is φ = 169135530.

The previous prime is 169135529. The next prime is 169135543. The reversal of 169135531 is 135531961.

It is a happy number.

169135531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (135531961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 169135531 - 2¹ = 169135529 is a prime.

It is a super-2 number, since 2×169135531² = 57213655693303922, which contains 22 as substring.

Together with 169135529, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (169135591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84567765 + 84567766.

It is an arithmetic number, because the mean of its divisors is an integer number (84567766).

Almost surely, 2^169135531 is an apocalyptic number.

169135531 is a deficient number, since it is larger than the sum of its proper divisors (1).

169135531 is an equidigital number, since it uses as much as digits as its factorization.

169135531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12150, while the sum is 34.

The square root of 169135531 is about 13005.2116860895. The cubic root of 169135531 is about 553.0252368236.

The spelling of 169135531 in words is "one hundred sixty-nine million, one hundred thirty-five thousand, five hundred thirty-one".