135732121 has 4 divisors (see below), whose sum is σ = 155122432. Its totient is φ = 116341812.

The previous prime is 135732083. The next prime is 135732127. The reversal of 135732121 is 121237531.

It is a happy number.

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 135732121 - 2¹⁵ = 135699353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135732127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9695145 + ... + 9695158.

It is an arithmetic number, because the mean of its divisors is an integer number (38780608).

Almost surely, 2^135732121 is an apocalyptic number.

It is an amenable number.

135732121 is a deficient number, since it is larger than the sum of its proper divisors (19390311).

135732121 is an equidigital number, since it uses as much as digits as its factorization.

135732121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19390310.

The product of its digits is 1260, while the sum is 25.

The square root of 135732121 is about 11650.4129111375. The cubic root of 135732121 is about 513.9184528990.

Adding to 135732121 its reverse (121237531), we get a palindrome (256969652).

The spelling of 135732121 in words is "one hundred thirty-five million, seven hundred thirty-two thousand, one hundred twenty-one".