144957991 has 2 divisors, whose sum is σ = 144957992. Its totient is φ = 144957990.

The previous prime is 144957947. The next prime is 144958043. The reversal of 144957991 is 199759441.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-144957991 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (144957391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72478995 + 72478996.

It is an arithmetic number, because the mean of its divisors is an integer number (72478996).

Almost surely, 2^144957991 is an apocalyptic number.

144957991 is a deficient number, since it is larger than the sum of its proper divisors (1).

144957991 is an equidigital number, since it uses as much as digits as its factorization.

144957991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 49.

The square root of 144957991 is about 12039.8501236519. The cubic root of 144957991 is about 525.3080471827.

The spelling of 144957991 in words is "one hundred forty-four million, nine hundred fifty-seven thousand, nine hundred ninety-one".