133246991 has 2 divisors, whose sum is σ = 133246992. Its totient is φ = 133246990.

The previous prime is 133246913. The next prime is 133247011. The reversal of 133246991 is 199642331.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133246991 is a prime.

It is a super-2 number, since 2×133246991² = 35509521221108162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133246591) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66623495 + 66623496.

It is an arithmetic number, because the mean of its divisors is an integer number (66623496).

Almost surely, 2^133246991 is an apocalyptic number.

133246991 is a deficient number, since it is larger than the sum of its proper divisors (1).

133246991 is an equidigital number, since it uses as much as digits as its factorization.

133246991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 38.

The square root of 133246991 is about 11543.2660456216. The cubic root of 133246991 is about 510.7626562096.

The spelling of 133246991 in words is "one hundred thirty-three million, two hundred forty-six thousand, nine hundred ninety-one".