133181903 has 2 divisors, whose sum is σ = 133181904. Its totient is φ = 133181902.

The previous prime is 133181869. The next prime is 133181911. The reversal of 133181903 is 309181331.

It is a strong prime.

It is an emirp because it is prime and its reverse (309181331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133181903 - 2¹⁴ = 133165519 is a prime.

It is a Sophie Germain prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133181953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66590951 + 66590952.

It is an arithmetic number, because the mean of its divisors is an integer number (66590952).

Almost surely, 2^133181903 is an apocalyptic number.

133181903 is a deficient number, since it is larger than the sum of its proper divisors (1).

133181903 is an equidigital number, since it uses as much as digits as its factorization.

133181903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 133181903 is about 11540.4463951790. The cubic root of 133181903 is about 510.6794775100.

The spelling of 133181903 in words is "one hundred thirty-three million, one hundred eighty-one thousand, nine hundred three".