133881377 has 6 divisors (see below), whose sum is σ = 155739618. Its totient is φ = 114755424.

The previous prime is 133881373. The next prime is 133881401. The reversal of 133881377 is 773188331.

It can be written as a sum of positive squares in only one way, i.e., 73290721 + 60590656 = 8561^2 + 7784^2 .

It is not a de Polignac number, because 133881377 - 2² = 133881373 is a prime.

It is a super-2 number, since 2×133881377² = 35848446214832258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133881373) 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 5 ways as a sum of consecutive naturals, for example, 1366088 + ... + 1366185.

It is an arithmetic number, because the mean of its divisors is an integer number (25956603).

Almost surely, 2^133881377 is an apocalyptic number.

It is an amenable number.

133881377 is a deficient number, since it is larger than the sum of its proper divisors (21858241).

133881377 is an equidigital number, since it uses as much as digits as its factorization.

133881377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2732287 (or 2732280 counting only the distinct ones).

The product of its digits is 84672, while the sum is 41.

The square root of 133881377 is about 11570.7120351342. The cubic root of 133881377 is about 511.5719498213.

The spelling of 133881377 in words is "one hundred thirty-three million, eight hundred eighty-one thousand, three hundred seventy-seven".