133780681 has 4 divisors (see below), whose sum is σ = 133933072. Its totient is φ = 133628292.

The previous prime is 133780679. The next prime is 133780687. The reversal of 133780681 is 186087331.

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 133780681 - 2¹ = 133780679 is a prime.

It is a super-2 number, since 2×133780681² = 35794541217647522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 133780681.

It is not an unprimeable number, because it can be changed into a prime (133780687) 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, 74871 + ... + 76636.

It is an arithmetic number, because the mean of its divisors is an integer number (33483268).

Almost surely, 2^133780681 is an apocalyptic number.

It is an amenable number.

133780681 is a deficient number, since it is larger than the sum of its proper divisors (152391).

133780681 is an equidigital number, since it uses as much as digits as its factorization.

133780681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152390.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 133780681 is about 11566.3598854609. The cubic root of 133780681 is about 511.4436617041.

The spelling of 133780681 in words is "one hundred thirty-three million, seven hundred eighty thousand, six hundred eighty-one".