135021641 has 4 divisors (see below), whose sum is σ = 135232272. Its totient is φ = 134811012.

The previous prime is 135021629. The next prime is 135021673. The reversal of 135021641 is 146120531.

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 135021641 - 2⁶ = 135021577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135021611) 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, 104351 + ... + 105636.

It is an arithmetic number, because the mean of its divisors is an integer number (33808068).

Almost surely, 2^135021641 is an apocalyptic number.

It is an amenable number.

135021641 is a deficient number, since it is larger than the sum of its proper divisors (210631).

135021641 is an equidigital number, since it uses as much as digits as its factorization.

135021641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210630.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 135021641 is about 11619.8812816655. The cubic root of 135021641 is about 513.0201940862.

The spelling of 135021641 in words is "one hundred thirty-five million, twenty-one thousand, six hundred forty-one".