135440581 has 8 divisors (see below), whose sum is σ = 148034304. Its totient is φ = 123360960.

The previous prime is 135440579. The next prime is 135440587. The reversal of 135440581 is 185044531.

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

It is a cyclic number.

It is not a de Polignac number, because 135440581 - 2¹ = 135440579 is a prime.

It is a super-2 number, since 2×135440581² = 36688301963235122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135440587) 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, 127975 + ... + 129028.

It is an arithmetic number, because the mean of its divisors is an integer number (18504288).

Almost surely, 2^135440581 is an apocalyptic number.

It is an amenable number.

135440581 is a deficient number, since it is larger than the sum of its proper divisors (12593723).

135440581 is a wasteful number, since it uses less digits than its factorization.

135440581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257051.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 135440581 is about 11637.8941823682. The cubic root of 135440581 is about 513.5502394285.

The spelling of 135440581 in words is "one hundred thirty-five million, four hundred forty thousand, five hundred eighty-one".