133648993 has 2 divisors, whose sum is σ = 133648994. Its totient is φ = 133648992.

The previous prime is 133648981. The next prime is 133649017. The reversal of 133648993 is 399846331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126157824 + 7491169 = 11232^2 + 2737^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133648993 is a prime.

It is not a weakly prime, because it can be changed into another prime (133648903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66824496 + 66824497.

It is an arithmetic number, because the mean of its divisors is an integer number (66824497).

Almost surely, 2^133648993 is an apocalyptic number.

It is an amenable number.

133648993 is a deficient number, since it is larger than the sum of its proper divisors (1).

133648993 is an equidigital number, since it uses as much as digits as its factorization.

133648993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 46.

The square root of 133648993 is about 11560.6657680256. The cubic root of 133648993 is about 511.2757921641.

The spelling of 133648993 in words is "one hundred thirty-three million, six hundred forty-eight thousand, nine hundred ninety-three".