144638491 has 2 divisors, whose sum is σ = 144638492. Its totient is φ = 144638490.

The previous prime is 144638489. The next prime is 144638497. The reversal of 144638491 is 194836441.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 144638491 - 2¹ = 144638489 is a prime.

Together with 144638489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (144638497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72319245 + 72319246.

It is an arithmetic number, because the mean of its divisors is an integer number (72319246).

Almost surely, 2^144638491 is an apocalyptic number.

144638491 is a deficient number, since it is larger than the sum of its proper divisors (1).

144638491 is an equidigital number, since it uses as much as digits as its factorization.

144638491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 40.

The square root of 144638491 is about 12026.5743667929. The cubic root of 144638491 is about 524.9218217679.

The spelling of 144638491 in words is "one hundred forty-four million, six hundred thirty-eight thousand, four hundred ninety-one".