135172661 has 8 divisors (see below), whose sum is σ = 154133784. Its totient is φ = 117434880.

The previous prime is 135172657. The next prime is 135172663. The reversal of 135172661 is 166271531.

It can be written as a sum of positive squares in 4 ways, for example, as 28153636 + 107019025 = 5306^2 + 10345^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 135172661 - 2² = 135172657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135172663) 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 7 ways as a sum of consecutive naturals, for example, 305600 + ... + 306041.

It is an arithmetic number, because the mean of its divisors is an integer number (19266723).

Almost surely, 2^135172661 is an apocalyptic number.

It is an amenable number.

135172661 is a deficient number, since it is larger than the sum of its proper divisors (18961123).

135172661 is a wasteful number, since it uses less digits than its factorization.

135172661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611671.

The product of its digits is 7560, while the sum is 32.

The square root of 135172661 is about 11626.3778108231. The cubic root of 135172661 is about 513.2113916889.

The spelling of 135172661 in words is "one hundred thirty-five million, one hundred seventy-two thousand, six hundred sixty-one".