135671661 has 6 divisors (see below), whose sum is σ = 195970190. Its totient is φ = 90447768.

The previous prime is 135671659. The next prime is 135671671. The reversal of 135671661 is 166176531.

135671661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 86601636 + 49070025 = 9306^2 + 7005^2 .

It is not a de Polignac number, because 135671661 - 2¹ = 135671659 is a prime.

It is a super-3 number, since 3×135671661³ (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 (135671671) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7537306 + ... + 7537323.

Almost surely, 2^135671661 is an apocalyptic number.

It is an amenable number.

135671661 is a deficient number, since it is larger than the sum of its proper divisors (60298529).

135671661 is a wasteful number, since it uses less digits than its factorization.

135671661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15074635 (or 15074632 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 135671661 is about 11647.8178643040. The cubic root of 135671661 is about 513.8421356058.

The spelling of 135671661 in words is "one hundred thirty-five million, six hundred seventy-one thousand, six hundred sixty-one".