135037621 has 4 divisors (see below), whose sum is σ = 135090144. Its totient is φ = 134985100.

The previous prime is 135037603. The next prime is 135037633. The reversal of 135037621 is 126730531.

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: 126730531 = 499 ⋅253969.

It is a cyclic number.

It is not a de Polignac number, because 135037621 - 2⁹ = 135037109 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 135037621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135037691) 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, 22195 + ... + 27616.

It is an arithmetic number, because the mean of its divisors is an integer number (33772536).

Almost surely, 2^135037621 is an apocalyptic number.

It is an amenable number.

135037621 is a deficient number, since it is larger than the sum of its proper divisors (52523).

135037621 is an equidigital number, since it uses as much as digits as its factorization.

135037621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52522.

The product of its (nonzero) digits is 3780, while the sum is 28.

The square root of 135037621 is about 11620.5688759200. The cubic root of 135037621 is about 513.0404321735.

The spelling of 135037621 in words is "one hundred thirty-five million, thirty-seven thousand, six hundred twenty-one".