133553237 has 2 divisors, whose sum is σ = 133553238. Its totient is φ = 133553236.

The previous prime is 133553191. The next prime is 133553263. The reversal of 133553237 is 732355331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104673361 + 28879876 = 10231^2 + 5374^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133553237 is a prime.

It is a super-2 number, since 2×133553237² = 35672934226356338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133553267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66776618 + 66776619.

It is an arithmetic number, because the mean of its divisors is an integer number (66776619).

Almost surely, 2^133553237 is an apocalyptic number.

It is an amenable number.

133553237 is a deficient number, since it is larger than the sum of its proper divisors (1).

133553237 is an equidigital number, since it uses as much as digits as its factorization.

133553237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28350, while the sum is 32.

The square root of 133553237 is about 11556.5235689631. The cubic root of 133553237 is about 511.1536577566.

The spelling of 133553237 in words is "one hundred thirty-three million, five hundred fifty-three thousand, two hundred thirty-seven".