135413721 has 32 divisors (see below), whose sum is σ = 216967680. Its totient is φ = 83144448.

The previous prime is 135413701. The next prime is 135413749. The reversal of 135413721 is 127314531.

135413721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 135413721 - 2²⁶ = 68304857 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (135413701) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18435 + ... + 24711.

It is an arithmetic number, because the mean of its divisors is an integer number (6780240).

Almost surely, 2^135413721 is an apocalyptic number.

It is an amenable number.

135413721 is a deficient number, since it is larger than the sum of its proper divisors (81553959).

135413721 is a wasteful number, since it uses less digits than its factorization.

135413721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6350 (or 6344 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 135413721 is about 11636.7401363097. The cubic root of 135413721 is about 513.5162888176.

The spelling of 135413721 in words is "one hundred thirty-five million, four hundred thirteen thousand, seven hundred twenty-one".