135616321 has 4 divisors (see below), whose sum is σ = 135648432. Its totient is φ = 135584212.

The previous prime is 135616301. The next prime is 135616381. The reversal of 135616321 is 123616531.

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, and also an emirpimes, since its reverse is a distinct semiprime: 123616531 = 29 ⋅4262639.

It is a cyclic number.

It is not a de Polignac number, because 135616321 - 2⁷ = 135616193 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 135616321.

It is not an unprimeable number, because it can be changed into a prime (135616301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8551 + ... + 18556.

It is an arithmetic number, because the mean of its divisors is an integer number (33912108).

Almost surely, 2^135616321 is an apocalyptic number.

It is an amenable number.

135616321 is a deficient number, since it is larger than the sum of its proper divisors (32111).

135616321 is an equidigital number, since it uses as much as digits as its factorization.

135616321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32110.

The product of its digits is 3240, while the sum is 28.

The square root of 135616321 is about 11645.4420697542. The cubic root of 135616321 is about 513.7722612960.

The spelling of 135616321 in words is "one hundred thirty-five million, six hundred sixteen thousand, three hundred twenty-one".