135365921 has 4 divisors (see below), whose sum is σ = 135658752. Its totient is φ = 135073092.

The previous prime is 135365891. The next prime is 135365953. The reversal of 135365921 is 129563531.

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 a de Polignac number, because none of the positive numbers 2^k-135365921 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (135365221) 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, 145721 + ... + 146646.

It is an arithmetic number, because the mean of its divisors is an integer number (33914688).

Almost surely, 2^135365921 is an apocalyptic number.

It is an amenable number.

135365921 is a deficient number, since it is larger than the sum of its proper divisors (292831).

135365921 is an equidigital number, since it uses as much as digits as its factorization.

135365921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292830.

The product of its digits is 24300, while the sum is 35.

The square root of 135365921 is about 11634.6861152332. The cubic root of 135365921 is about 513.4558592758.

The spelling of 135365921 in words is "one hundred thirty-five million, three hundred sixty-five thousand, nine hundred twenty-one".