135644531 has 8 divisors (see below), whose sum is σ = 148630464. Its totient is φ = 122767720.

The previous prime is 135644527. The next prime is 135644549. The reversal of 135644531 is 135446531.

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 135644531 - 2² = 135644527 is a prime.

It is a super-2 number, since 2×135644531² = 36798877580419922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135644521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24665 + ... + 29658.

It is an arithmetic number, because the mean of its divisors is an integer number (18578808).

Almost surely, 2^135644531 is an apocalyptic number.

135644531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

135644531 is a deficient number, since it is larger than the sum of its proper divisors (12985933).

135644531 is a wasteful number, since it uses less digits than its factorization.

135644531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54561.

The product of its digits is 21600, while the sum is 32.

The square root of 135644531 is about 11646.6532102574. The cubic root of 135644531 is about 513.8078826494.

The spelling of 135644531 in words is "one hundred thirty-five million, six hundred forty-four thousand, five hundred thirty-one".