133139381 has 2 divisors, whose sum is σ = 133139382. Its totient is φ = 133139380.

The previous prime is 133139353. The next prime is 133139399. The reversal of 133139381 is 183931331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75516100 + 57623281 = 8690^2 + 7591^2 .

It is a cyclic number.

It is not a de Polignac number, because 133139381 - 2⁶ = 133139317 is a prime.

It is a super-2 number, since 2×133139381² = 35452189546126322, which contains 22 as substring.

It is equal to p_7546109 and since 133139381 and 7546109 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133139081) 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 as a sum of consecutive naturals, namely, 66569690 + 66569691.

It is an arithmetic number, because the mean of its divisors is an integer number (66569691).

Almost surely, 2^133139381 is an apocalyptic number.

It is an amenable number.

133139381 is a deficient number, since it is larger than the sum of its proper divisors (1).

133139381 is an equidigital number, since it uses as much as digits as its factorization.

133139381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 32.

The square root of 133139381 is about 11538.6039450187. The cubic root of 133139381 is about 510.6251222167.

The spelling of 133139381 in words is "one hundred thirty-three million, one hundred thirty-nine thousand, three hundred eighty-one".