133571939 has 2 divisors, whose sum is σ = 133571940. Its totient is φ = 133571938.

The previous prime is 133571927. The next prime is 133571947. The reversal of 133571939 is 939175331.

It is a strong prime.

It is an emirp because it is prime and its reverse (939175331) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133571939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 133571896 and 133571905.

It is not a weakly prime, because it can be changed into another prime (133571959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66785969 + 66785970.

It is an arithmetic number, because the mean of its divisors is an integer number (66785970).

Almost surely, 2^133571939 is an apocalyptic number.

133571939 is a deficient number, since it is larger than the sum of its proper divisors (1).

133571939 is an equidigital number, since it uses as much as digits as its factorization.

133571939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 76545, while the sum is 41.

The square root of 133571939 is about 11557.3326940086. The cubic root of 133571939 is about 511.1775162810.

The spelling of 133571939 in words is "one hundred thirty-three million, five hundred seventy-one thousand, nine hundred thirty-nine".