133166591 has 2 divisors, whose sum is σ = 133166592. Its totient is φ = 133166590.

The previous prime is 133166563. The next prime is 133166597. The reversal of 133166591 is 195661331.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 133166591 - 2¹⁴ = 133150207 is a prime.

It is a super-2 number, since 2×133166591² = 35466681917122562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133166597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66583295 + 66583296.

It is an arithmetic number, because the mean of its divisors is an integer number (66583296).

Almost surely, 2^133166591 is an apocalyptic number.

133166591 is a deficient number, since it is larger than the sum of its proper divisors (1).

133166591 is an equidigital number, since it uses as much as digits as its factorization.

133166591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14580, while the sum is 35.

The square root of 133166591 is about 11539.7829702296. The cubic root of 133166591 is about 510.6599057222.

The spelling of 133166591 in words is "one hundred thirty-three million, one hundred sixty-six thousand, five hundred ninety-one".