133216637 has 2 divisors, whose sum is σ = 133216638. Its totient is φ = 133216636.

The previous prime is 133216597. The next prime is 133216649. The reversal of 133216637 is 736612331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132112036 + 1104601 = 11494^2 + 1051^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133216637 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133216697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66608318 + 66608319.

It is an arithmetic number, because the mean of its divisors is an integer number (66608319).

Almost surely, 2^133216637 is an apocalyptic number.

It is an amenable number.

133216637 is a deficient number, since it is larger than the sum of its proper divisors (1).

133216637 is an equidigital number, since it uses as much as digits as its factorization.

133216637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 32.

The square root of 133216637 is about 11541.9511782021. The cubic root of 133216637 is about 510.7238689245.

Adding to 133216637 its reverse (736612331), we get a palindrome (869828968).

The spelling of 133216637 in words is "one hundred thirty-three million, two hundred sixteen thousand, six hundred thirty-seven".