133613537 has 2 divisors, whose sum is σ = 133613538. Its totient is φ = 133613536.

The previous prime is 133613507. The next prime is 133613561. The reversal of 133613537 is 735316331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87590881 + 46022656 = 9359^2 + 6784^2 .

It is an emirp because it is prime and its reverse (735316331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133613537 - 2¹⁶ = 133548001 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (133613507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66806768 + 66806769.

It is an arithmetic number, because the mean of its divisors is an integer number (66806769).

Almost surely, 2^133613537 is an apocalyptic number.

It is an amenable number.

133613537 is a deficient number, since it is larger than the sum of its proper divisors (1).

133613537 is an equidigital number, since it uses as much as digits as its factorization.

133613537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17010, while the sum is 32.

The square root of 133613537 is about 11559.1321906102. The cubic root of 133613537 is about 511.2305757172.

Adding to 133613537 its reverse (735316331), we get a palindrome (868929868).

The spelling of 133613537 in words is "one hundred thirty-three million, six hundred thirteen thousand, five hundred thirty-seven".