135895621 has 4 divisors (see below), whose sum is σ = 136795744. Its totient is φ = 134995500.

The previous prime is 135895597. The next prime is 135895649. The reversal of 135895621 is 126598531.

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: 126598531 = 131 ⋅966401.

It is a cyclic number.

It is not a de Polignac number, because 135895621 - 2¹¹ = 135893573 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 (135892621) 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, 449835 + ... + 450136.

It is an arithmetic number, because the mean of its divisors is an integer number (34198936).

Almost surely, 2^135895621 is an apocalyptic number.

It is an amenable number.

135895621 is a deficient number, since it is larger than the sum of its proper divisors (900123).

135895621 is an equidigital number, since it uses as much as digits as its factorization.

135895621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 900122.

The product of its digits is 64800, while the sum is 40.

The square root of 135895621 is about 11657.4277179831. The cubic root of 135895621 is about 514.1247218119.

The spelling of 135895621 in words is "one hundred thirty-five million, eight hundred ninety-five thousand, six hundred twenty-one".