144931261 has 4 divisors (see below), whose sum is σ = 145022400. Its totient is φ = 144840124.

The previous prime is 144931247. The next prime is 144931271. The reversal of 144931261 is 162139441.

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, and also an emirpimes, since its reverse is a distinct semiprime: 162139441 = 101 ⋅1605341.

It is a cyclic number.

It is not a de Polignac number, because 144931261 - 2⁵ = 144931229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144931271) 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, 43141 + ... + 46378.

It is an arithmetic number, because the mean of its divisors is an integer number (36255600).

Almost surely, 2^144931261 is an apocalyptic number.

It is an amenable number.

144931261 is a deficient number, since it is larger than the sum of its proper divisors (91139).

144931261 is an equidigital number, since it uses as much as digits as its factorization.

144931261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91138.

The product of its digits is 5184, while the sum is 31.

The square root of 144931261 is about 12038.7400088215. The cubic root of 144931261 is about 525.2757565695.

The spelling of 144931261 in words is "one hundred forty-four million, nine hundred thirty-one thousand, two hundred sixty-one".