135721671 has 8 divisors (see below), whose sum is σ = 181082880. Its totient is φ = 90420792.

The previous prime is 135721667. The next prime is 135721681. The reversal of 135721671 is 176127531.

135721671 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 135721671 - 2² = 135721667 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135721601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9541 + ... + 19038.

It is an arithmetic number, because the mean of its divisors is an integer number (22635360).

Almost surely, 2^135721671 is an apocalyptic number.

135721671 is a deficient number, since it is larger than the sum of its proper divisors (45361209).

135721671 is a wasteful number, since it uses less digits than its factorization.

135721671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30165.

The product of its digits is 8820, while the sum is 33.

The square root of 135721671 is about 11649.9644205465. The cubic root of 135721671 is about 513.9052637202.

The spelling of 135721671 in words is "one hundred thirty-five million, seven hundred twenty-one thousand, six hundred seventy-one".