144187561 has 16 divisors (see below), whose sum is σ = 175667200. Its totient is φ = 115594128.

The previous prime is 144187531. The next prime is 144187567. The reversal of 144187561 is 165781441.

It is a cyclic number.

It is not a de Polignac number, because 144187561 - 2⁹ = 144187049 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 144187561.

It is not an unprimeable number, because it can be changed into a prime (144187567) 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, 3646 + ... + 17368.

It is an arithmetic number, because the mean of its divisors is an integer number (10979200).

Almost surely, 2^144187561 is an apocalyptic number.

It is an amenable number.

144187561 is a deficient number, since it is larger than the sum of its proper divisors (31479639).

144187561 is a wasteful number, since it uses less digits than its factorization.

144187561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13828.

The product of its digits is 26880, while the sum is 37.

The square root of 144187561 is about 12007.8124985361. The cubic root of 144187561 is about 524.3757490342.

The spelling of 144187561 in words is "one hundred forty-four million, one hundred eighty-seven thousand, five hundred sixty-one".