133872649 has 2 divisors, whose sum is σ = 133872650. Its totient is φ = 133872648.

The previous prime is 133872617. The next prime is 133872677. The reversal of 133872649 is 946278331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131790400 + 2082249 = 11480^2 + 1443^2 .

It is an emirp because it is prime and its reverse (946278331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133872649 - 2⁵ = 133872617 is a prime.

It is not a weakly prime, because it can be changed into another prime (133872679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66936324 + 66936325.

It is an arithmetic number, because the mean of its divisors is an integer number (66936325).

Almost surely, 2^133872649 is an apocalyptic number.

It is an amenable number.

133872649 is a deficient number, since it is larger than the sum of its proper divisors (1).

133872649 is an equidigital number, since it uses as much as digits as its factorization.

133872649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 43.

The square root of 133872649 is about 11570.3348698298. The cubic root of 133872649 is about 511.5608327734.

The spelling of 133872649 in words is "one hundred thirty-three million, eight hundred seventy-two thousand, six hundred forty-nine".