133981656 has 16 divisors (see below), whose sum is σ = 334954200. Its totient is φ = 44660544.

The previous prime is 133981649. The next prime is 133981663. The reversal of 133981656 is 656189331.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (133981649) and next prime (133981663).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2791261 + ... + 2791308.

Almost surely, 2^133981656 is an apocalyptic number.

It is an amenable number.

133981656 is an abundant number, since it is smaller than the sum of its proper divisors (200972544).

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

133981656 is a wasteful number, since it uses less digits than its factorization.

133981656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5582578 (or 5582574 counting only the distinct ones).

The product of its digits is 116640, while the sum is 42.

The square root of 133981656 is about 11575.0445355515. The cubic root of 133981656 is about 511.6996427634.

The spelling of 133981656 in words is "one hundred thirty-three million, nine hundred eighty-one thousand, six hundred fifty-six".