133539613 has 4 divisors (see below), whose sum is σ = 135148608. Its totient is φ = 131930620.

The previous prime is 133539589. The next prime is 133539617. The reversal of 133539613 is 316935331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 133539613 - 2²¹ = 131442461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133539617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 804373 + ... + 804538.

It is an arithmetic number, because the mean of its divisors is an integer number (33787152).

Almost surely, 2^133539613 is an apocalyptic number.

It is an amenable number.

133539613 is a deficient number, since it is larger than the sum of its proper divisors (1608995).

133539613 is an equidigital number, since it uses as much as digits as its factorization.

133539613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1608994.

The product of its digits is 21870, while the sum is 34.

The square root of 133539613 is about 11555.9341033081. The cubic root of 133539613 is about 511.1362759384.

The spelling of 133539613 in words is "one hundred thirty-three million, five hundred thirty-nine thousand, six hundred thirteen".