144689561 has 4 divisors (see below), whose sum is σ = 144788352. Its totient is φ = 144590772.

The previous prime is 144689537. The next prime is 144689563. The reversal of 144689561 is 165986441.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-144689561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (144689563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47165 + ... + 50138.

It is an arithmetic number, because the mean of its divisors is an integer number (36197088).

Almost surely, 2^144689561 is an apocalyptic number.

It is an amenable number.

144689561 is a deficient number, since it is larger than the sum of its proper divisors (98791).

144689561 is an equidigital number, since it uses as much as digits as its factorization.

144689561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98790.

The product of its digits is 207360, while the sum is 44.

The square root of 144689561 is about 12028.6973941487. The cubic root of 144689561 is about 524.9835955570.

The spelling of 144689561 in words is "one hundred forty-four million, six hundred eighty-nine thousand, five hundred sixty-one".