133649839 has 2 divisors, whose sum is σ = 133649840. Its totient is φ = 133649838.

The previous prime is 133649833. The next prime is 133649851. The reversal of 133649839 is 938946331.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 133649839 - 2⁵ = 133649807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133649833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66824919 + 66824920.

It is an arithmetic number, because the mean of its divisors is an integer number (66824920).

Almost surely, 2^133649839 is an apocalyptic number.

133649839 is a deficient number, since it is larger than the sum of its proper divisors (1).

133649839 is an equidigital number, since it uses as much as digits as its factorization.

133649839 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 133649839 is about 11560.7023575560. The cubic root of 133649839 is about 511.2768709561.

The spelling of 133649839 in words is "one hundred thirty-three million, six hundred forty-nine thousand, eight hundred thirty-nine".