133691861 has 8 divisors (see below), whose sum is σ = 135085440. Its totient is φ = 132304608.

The previous prime is 133691851. The next prime is 133691869. The reversal of 133691861 is 168196331.

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 133691861 - 2⁶ = 133691797 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 (133691869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48950 + ... + 51608.

It is an arithmetic number, because the mean of its divisors is an integer number (16885680).

Almost surely, 2^133691861 is an apocalyptic number.

It is an amenable number.

133691861 is a deficient number, since it is larger than the sum of its proper divisors (1393579).

133691861 is a wasteful number, since it uses less digits than its factorization.

133691861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3163.

The product of its digits is 23328, while the sum is 38.

The square root of 133691861 is about 11562.5196648481. The cubic root of 133691861 is about 511.3304503331.

The spelling of 133691861 in words is "one hundred thirty-three million, six hundred ninety-one thousand, eight hundred sixty-one".