133026381 has 20 divisors (see below), whose sum is σ = 201525984. Its totient is φ = 87431400.

The previous prime is 133026371. The next prime is 133026389. The reversal of 133026381 is 183620331.

It is a happy number.

It is not a de Polignac number, because 133026381 - 2⁹ = 133025869 is a prime.

It is a super-2 number, since 2×133026381² = 35392036083914322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133026389) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 5815 + ... + 17316.

Almost surely, 2^133026381 is an apocalyptic number.

It is an amenable number.

133026381 is a deficient number, since it is larger than the sum of its proper divisors (68499603).

133026381 is an equidigital number, since it uses as much as digits as its factorization.

133026381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23214 (or 23205 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 133026381 is about 11533.7062993645. The cubic root of 133026381 is about 510.4806195903.

It can be divided in two parts, 13302 and 6381, that added together give a 9-th power (19683 = 3⁹).

The spelling of 133026381 in words is "one hundred thirty-three million, twenty-six thousand, three hundred eighty-one".