135531997 has 8 divisors (see below), whose sum is σ = 142992000. Its totient is φ = 128104704.

The previous prime is 135531983. The next prime is 135532003. The reversal of 135531997 is 799135531.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135531997 is a prime.

It is a super-3 number, since 3×135531997³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135531947) 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, 588 + ... + 16474.

It is an arithmetic number, because the mean of its divisors is an integer number (17874000).

Almost surely, 2^135531997 is an apocalyptic number.

It is an amenable number.

135531997 is a deficient number, since it is larger than the sum of its proper divisors (7460003).

135531997 is a wasteful number, since it uses less digits than its factorization.

135531997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16355.

The product of its digits is 127575, while the sum is 43.

The square root of 135531997 is about 11641.8210345289. The cubic root of 135531997 is about 513.6657541682.

The spelling of 135531997 in words is "one hundred thirty-five million, five hundred thirty-one thousand, nine hundred ninety-seven".