133618643 has 2 divisors, whose sum is σ = 133618644. Its totient is φ = 133618642.

The previous prime is 133618613. The next prime is 133618651. The reversal of 133618643 is 346816331.

It is a strong prime.

It is an emirp because it is prime and its reverse (346816331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133618643 - 2¹⁶ = 133553107 is a prime.

It is a super-2 number, since 2×133618643² = 35707883514322898, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (133618613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66809321 + 66809322.

It is an arithmetic number, because the mean of its divisors is an integer number (66809322).

Almost surely, 2^133618643 is an apocalyptic number.

133618643 is a deficient number, since it is larger than the sum of its proper divisors (1).

133618643 is an equidigital number, since it uses as much as digits as its factorization.

133618643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 35.

The square root of 133618643 is about 11559.3530528313. The cubic root of 133618643 is about 511.2370878070.

The spelling of 133618643 in words is "one hundred thirty-three million, six hundred eighteen thousand, six hundred forty-three".