135235661 has 4 divisors (see below), whose sum is σ = 147529824. Its totient is φ = 122941500.

The previous prime is 135235651. The next prime is 135235669. The reversal of 135235661 is 166532531.

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, and also an emirpimes, since its reverse is a distinct semiprime: 166532531 = 11 ⋅15139321.

It is not a de Polignac number, because 135235661 - 2²⁶ = 68126797 is a prime.

It is a super-2 number, since 2×135235661² = 36577368012213842, which contains 22 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 (135235669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6147065 + ... + 6147086.

It is an arithmetic number, because the mean of its divisors is an integer number (36882456).

Almost surely, 2^135235661 is an apocalyptic number.

135235661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

135235661 is a deficient number, since it is larger than the sum of its proper divisors (12294163).

135235661 is a wasteful number, since it uses less digits than its factorization.

135235661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12294162.

The product of its digits is 16200, while the sum is 32.

The square root of 135235661 is about 11629.0868515116. The cubic root of 135235661 is about 513.2911102150.

The spelling of 135235661 in words is "one hundred thirty-five million, two hundred thirty-five thousand, six hundred sixty-one".