142640561 has 8 divisors (see below), whose sum is σ = 164514240. Its totient is φ = 121141008.

The previous prime is 142640551. The next prime is 142640569. The reversal of 142640561 is 165046241.

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 142640561 - 2⁶ = 142640497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (142640569) 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, 92711 + ... + 94236.

It is an arithmetic number, because the mean of its divisors is an integer number (20564280).

Almost surely, 2^142640561 is an apocalyptic number.

It is an amenable number.

142640561 is a deficient number, since it is larger than the sum of its proper divisors (21873679).

142640561 is a wasteful number, since it uses less digits than its factorization.

142640561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187063.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 142640561 is about 11943.2223876138. Note that the first 3 decimals coincide. The cubic root of 142640561 is about 522.4936452147.

The spelling of 142640561 in words is "one hundred forty-two million, six hundred forty thousand, five hundred sixty-one".