144897961 has 4 divisors (see below), whose sum is σ = 156043972. Its totient is φ = 133751952.

The previous prime is 144897943. The next prime is 144897989. The reversal of 144897961 is 169798441.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 169798441 = 61 ⋅2783581.

It can be written as a sum of positive squares in 2 ways, for example, as 64705936 + 80192025 = 8044^2 + 8955^2 .

It is a cyclic number.

It is not a de Polignac number, because 144897961 - 2⁹ = 144897449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (144897911) 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, 5572986 + ... + 5573011.

It is an arithmetic number, because the mean of its divisors is an integer number (39010993).

Almost surely, 2^144897961 is an apocalyptic number.

It is an amenable number.

144897961 is a deficient number, since it is larger than the sum of its proper divisors (11146011).

144897961 is a wasteful number, since it uses less digits than its factorization.

144897961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11146010.

The product of its digits is 435456, while the sum is 49.

The square root of 144897961 is about 12037.3568942688. The cubic root of 144897961 is about 525.2355236517.

The spelling of 144897961 in words is "one hundred forty-four million, eight hundred ninety-seven thousand, nine hundred sixty-one".