133888861 has 4 divisors (see below), whose sum is σ = 134943232. Its totient is φ = 132834492.

The previous prime is 133888837. The next prime is 133888871. The reversal of 133888861 is 168888331.

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.

It is a cyclic number.

It is not a de Polignac number, because 133888861 - 2¹¹ = 133886813 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 (133888871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 526995 + ... + 527248.

It is an arithmetic number, because the mean of its divisors is an integer number (33735808).

Almost surely, 2^133888861 is an apocalyptic number.

It is an amenable number.

133888861 is a deficient number, since it is larger than the sum of its proper divisors (1054371).

133888861 is a wasteful number, since it uses less digits than its factorization.

133888861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1054370.

The product of its digits is 221184, while the sum is 46.

The square root of 133888861 is about 11571.0354333569. The cubic root of 133888861 is about 511.5814819738.

The spelling of 133888861 in words is "one hundred thirty-three million, eight hundred eighty-eight thousand, eight hundred sixty-one".