133913237 has 2 divisors, whose sum is σ = 133913238. Its totient is φ = 133913236.

The previous prime is 133913209. The next prime is 133913251. The reversal of 133913237 is 732319331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129937201 + 3976036 = 11399^2 + 1994^2 .

It is an emirp because it is prime and its reverse (732319331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133913237 - 2¹² = 133909141 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 (133913537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66956618 + 66956619.

It is an arithmetic number, because the mean of its divisors is an integer number (66956619).

Almost surely, 2^133913237 is an apocalyptic number.

It is an amenable number.

133913237 is a deficient number, since it is larger than the sum of its proper divisors (1).

133913237 is an equidigital number, since it uses as much as digits as its factorization.

133913237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10206, while the sum is 32.

The square root of 133913237 is about 11572.0887051560. The cubic root of 133913237 is about 511.6125265118.

The spelling of 133913237 in words is "one hundred thirty-three million, nine hundred thirteen thousand, two hundred thirty-seven".