135947861 has 16 divisors (see below), whose sum is σ = 166602240. Its totient is φ = 108276480.

The previous prime is 135947857. The next prime is 135947863. The reversal of 135947861 is 168749531.

It is a cyclic number.

It is not a de Polignac number, because 135947861 - 2² = 135947857 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135947863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2171 + ... + 16631.

It is an arithmetic number, because the mean of its divisors is an integer number (10412640).

Almost surely, 2^135947861 is an apocalyptic number.

It is an amenable number.

135947861 is a deficient number, since it is larger than the sum of its proper divisors (30654379).

135947861 is a wasteful number, since it uses less digits than its factorization.

135947861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14564.

The product of its digits is 181440, while the sum is 44.

The square root of 135947861 is about 11659.6681342138. The cubic root of 135947861 is about 514.1905920597.

The spelling of 135947861 in words is "one hundred thirty-five million, nine hundred forty-seven thousand, eight hundred sixty-one".