143641561 has 8 divisors (see below), whose sum is σ = 164236160. Its totient is φ = 123065568.

The previous prime is 143641549. The next prime is 143641567. The reversal of 143641561 is 165146341.

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 143641561 - 2⁵ = 143641529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (143641567) 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, 22405 + ... + 28093.

It is an arithmetic number, because the mean of its divisors is an integer number (20529520).

Almost surely, 2^143641561 is an apocalyptic number.

It is an amenable number.

143641561 is a deficient number, since it is larger than the sum of its proper divisors (20594599).

143641561 is an equidigital number, since it uses as much as digits as its factorization.

143641561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9303.

The product of its digits is 8640, while the sum is 31.

The square root of 143641561 is about 11985.0557362075. The cubic root of 143641561 is about 523.7130212385.

The spelling of 143641561 in words is "one hundred forty-three million, six hundred forty-one thousand, five hundred sixty-one".