133051381 has 4 divisors (see below), whose sum is σ = 133377100. Its totient is φ = 132725664.

The previous prime is 133051363. The next prime is 133051421. The reversal of 133051381 is 183150331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 122456356 + 10595025 = 11066^2 + 3255^2 .

It is a cyclic number.

It is not a de Polignac number, because 133051381 - 2¹⁹ = 132527093 is a prime.

It is a super-2 number, since 2×133051381² = 35405339972014322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133051301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162246 + ... + 163063.

It is an arithmetic number, because the mean of its divisors is an integer number (33344275).

Almost surely, 2^133051381 is an apocalyptic number.

It is an amenable number.

133051381 is a deficient number, since it is larger than the sum of its proper divisors (325719).

133051381 is an equidigital number, since it uses as much as digits as its factorization.

133051381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325718.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 133051381 is about 11534.7900284314. The cubic root of 133051381 is about 510.5125962454.

The spelling of 133051381 in words is "one hundred thirty-three million, fifty-one thousand, three hundred eighty-one".