647640141 has 16 divisors (see below), whose sum is σ = 923045760. Its totient is φ = 402913280.

The previous prime is 647640121. The next prime is 647640163. The reversal of 647640141 is 141046746.

It is a cyclic number.

It is not a de Polignac number, because 647640141 - 2¹⁰ = 647639117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647640121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111636 + ... + 117293.

It is an arithmetic number, because the mean of its divisors is an integer number (57690360).

Almost surely, 2^647640141 is an apocalyptic number.

It is an amenable number.

647640141 is a deficient number, since it is larger than the sum of its proper divisors (275405619).

647640141 is a wasteful number, since it uses less digits than its factorization.

647640141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228996.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 647640141 is about 25448.7748428092. The cubic root of 647640141 is about 865.1895253349.

Adding to 647640141 its reverse (141046746), we get a palindrome (788686887).

The spelling of 647640141 in words is "six hundred forty-seven million, six hundred forty thousand, one hundred forty-one".