135721633 has 8 divisors (see below), whose sum is σ = 137649600. Its totient is φ = 133807440.

The previous prime is 135721613. The next prime is 135721637. The reversal of 135721633 is 336127531.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 135721633 - 2⁵ = 135721601 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 135721595 and 135721604.

It is not an unprimeable number, because it can be changed into a prime (135721637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17268 + ... + 23866.

It is an arithmetic number, because the mean of its divisors is an integer number (17206200).

Almost surely, 2^135721633 is an apocalyptic number.

It is an amenable number.

135721633 is a deficient number, since it is larger than the sum of its proper divisors (1927967).

135721633 is a wasteful number, since it uses less digits than its factorization.

135721633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6887.

The product of its digits is 11340, while the sum is 31.

The square root of 135721633 is about 11649.9627896401. The cubic root of 135721633 is about 513.9052157583.

The spelling of 135721633 in words is "one hundred thirty-five million, seven hundred twenty-one thousand, six hundred thirty-three".