135651621 has 32 divisors (see below), whose sum is σ = 219381760. Its totient is φ = 72830016.

The previous prime is 135651601. The next prime is 135651623. The reversal of 135651621 is 126156531.

It is not a de Polignac number, because 135651621 - 2¹¹ = 135649573 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 (135651623) 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 31 ways as a sum of consecutive naturals, for example, 49335 + ... + 52011.

It is an arithmetic number, because the mean of its divisors is an integer number (6855680).

Almost surely, 2^135651621 is an apocalyptic number.

It is an amenable number.

135651621 is a deficient number, since it is larger than the sum of its proper divisors (83730139).

135651621 is a wasteful number, since it uses less digits than its factorization.

135651621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2833.

The product of its digits is 5400, while the sum is 30.

The square root of 135651621 is about 11646.9575855671. The cubic root of 135651621 is about 513.8168345631.

The spelling of 135651621 in words is "one hundred thirty-five million, six hundred fifty-one thousand, six hundred twenty-one".