133228661 has 2 divisors, whose sum is σ = 133228662. Its totient is φ = 133228660.

The previous prime is 133228649. The next prime is 133228727. The reversal of 133228661 is 166822331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117180625 + 16048036 = 10825^2 + 4006^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133228661 is a prime.

It is a super-2 number, since 2×133228661² = 35499752223705842, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133228621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66614330 + 66614331.

It is an arithmetic number, because the mean of its divisors is an integer number (66614331).

Almost surely, 2^133228661 is an apocalyptic number.

It is an amenable number.

133228661 is a deficient number, since it is larger than the sum of its proper divisors (1).

133228661 is an equidigital number, since it uses as much as digits as its factorization.

133228661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 32.

The square root of 133228661 is about 11542.4720489157. The cubic root of 133228661 is about 510.7392342702.

The spelling of 133228661 in words is "one hundred thirty-three million, two hundred twenty-eight thousand, six hundred sixty-one".