134640561 has 32 divisors (see below), whose sum is σ = 209392128. Its totient is φ = 76048640.

The previous prime is 134640557. The next prime is 134640563. The reversal of 134640561 is 165046431.

134640561 is nontrivially palindromic in base 9.

It is a cyclic number.

It is not a de Polignac number, because 134640561 - 2² = 134640557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (134640563) 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, 58906 + ... + 61148.

It is an arithmetic number, because the mean of its divisors is an integer number (6543504).

Almost surely, 2^134640561 is an apocalyptic number.

134640561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

134640561 is a deficient number, since it is larger than the sum of its proper divisors (74751567).

134640561 is a wasteful number, since it uses less digits than its factorization.

134640561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2381.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 134640561 is about 11603.4719373126. The cubic root of 134640561 is about 512.5370963431.

Adding to 134640561 its reverse (165046431), we get a palindrome (299686992).

The spelling of 134640561 in words is "one hundred thirty-four million, six hundred forty thousand, five hundred sixty-one".