133681806 has 32 divisors (see below), whose sum is σ = 297954720. Its totient is φ = 44428032.

The previous prime is 133681799. The next prime is 133681813. The reversal of 133681806 is 608186331.

It is an interprime number because it is at equal distance from previous prime (133681799) and next prime (133681813).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15556 + ... + 22568.

It is an arithmetic number, because the mean of its divisors is an integer number (9311085).

Almost surely, 2^133681806 is an apocalyptic number.

133681806 is an abundant number, since it is smaller than the sum of its proper divisors (164272914).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

133681806 is a wasteful number, since it uses less digits than its factorization.

133681806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7377 (or 7371 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 133681806 is about 11562.0848466010. The cubic root of 133681806 is about 511.3176309125.

The spelling of 133681806 in words is "one hundred thirty-three million, six hundred eighty-one thousand, eight hundred six".