135531061 has 4 divisors (see below), whose sum is σ = 135885312. Its totient is φ = 135176812.

The previous prime is 135531043. The next prime is 135531073. The reversal of 135531061 is 160135531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 135531061 - 2⁵ = 135531029 is a prime.

It is a super-3 number, since 3×135531061³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135531041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176551 + ... + 177316.

It is an arithmetic number, because the mean of its divisors is an integer number (33971328).

Almost surely, 2^135531061 is an apocalyptic number.

It is an amenable number.

135531061 is a deficient number, since it is larger than the sum of its proper divisors (354251).

135531061 is an equidigital number, since it uses as much as digits as its factorization.

135531061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354250.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 135531061 is about 11641.7808345631. The cubic root of 135531061 is about 513.6645716867.

Adding to 135531061 its reverse (160135531), we get a palindrome (295666592).

The spelling of 135531061 in words is "one hundred thirty-five million, five hundred thirty-one thousand, sixty-one".