133428949 has 2 divisors, whose sum is σ = 133428950. Its totient is φ = 133428948.

The previous prime is 133428923. The next prime is 133428983. The reversal of 133428949 is 949824331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110628324 + 22800625 = 10518^2 + 4775^2 .

It is a cyclic number.

It is not a de Polignac number, because 133428949 - 2⁵ = 133428917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133428989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66714474 + 66714475.

It is an arithmetic number, because the mean of its divisors is an integer number (66714475).

Almost surely, 2^133428949 is an apocalyptic number.

It is an amenable number.

133428949 is a deficient number, since it is larger than the sum of its proper divisors (1).

133428949 is an equidigital number, since it uses as much as digits as its factorization.

133428949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 43.

The square root of 133428949 is about 11551.1449216084. The cubic root of 133428949 is about 510.9950443949.

The spelling of 133428949 in words is "one hundred thirty-three million, four hundred twenty-eight thousand, nine hundred forty-nine".