135903861 has 6 divisors (see below), whose sum is σ = 196305590. Its totient is φ = 90602568.

The previous prime is 135903853. The next prime is 135903871. The reversal of 135903861 is 168309531.

It is a happy number.

135903861 is a `hidden beast` number, since 1 + 3 + 590 + 3 + 8 + 61 = 666.

135903861 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., 128119761 + 7784100 = 11319^2 + 2790^2 .

It is not a de Polignac number, because 135903861 - 2³ = 135903853 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 (135903811) 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, 7550206 + ... + 7550223.

Almost surely, 2^135903861 is an apocalyptic number.

It is an amenable number.

135903861 is a deficient number, since it is larger than the sum of its proper divisors (60401729).

135903861 is a wasteful number, since it uses less digits than its factorization.

135903861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15100435 (or 15100432 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 135903861 is about 11657.7811353619. The cubic root of 135903861 is about 514.1351128803.

The spelling of 135903861 in words is "one hundred thirty-five million, nine hundred three thousand, eight hundred sixty-one".