144136991 has 2 divisors, whose sum is σ = 144136992. Its totient is φ = 144136990.

The previous prime is 144136987. The next prime is 144137009. The reversal of 144136991 is 199631441.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 144136991 - 2² = 144136987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (144136981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72068495 + 72068496.

It is an arithmetic number, because the mean of its divisors is an integer number (72068496).

Almost surely, 2^144136991 is an apocalyptic number.

144136991 is a deficient number, since it is larger than the sum of its proper divisors (1).

144136991 is an equidigital number, since it uses as much as digits as its factorization.

144136991 is an evil number, because the sum of its binary digits is even.

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

The square root of 144136991 is about 12005.7066014458. The cubic root of 144136991 is about 524.3144381921.

The spelling of 144136991 in words is "one hundred forty-four million, one hundred thirty-six thousand, nine hundred ninety-one".