144991361 has 2 divisors, whose sum is σ = 144991362. Its totient is φ = 144991360.

The previous prime is 144991339. The next prime is 144991367. The reversal of 144991361 is 163199441.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126337600 + 18653761 = 11240^2 + 4319^2 .

It is a cyclic number.

It is not a de Polignac number, because 144991361 - 2¹⁸ = 144729217 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (144991367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72495680 + 72495681.

It is an arithmetic number, because the mean of its divisors is an integer number (72495681).

Almost surely, 2^144991361 is an apocalyptic number.

It is an amenable number.

144991361 is a deficient number, since it is larger than the sum of its proper divisors (1).

144991361 is an equidigital number, since it uses as much as digits as its factorization.

144991361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 38.

The square root of 144991361 is about 12041.2358584989. The cubic root of 144991361 is about 525.3483535373.

The spelling of 144991361 in words is "one hundred forty-four million, nine hundred ninety-one thousand, three hundred sixty-one".