144651989 has 2 divisors, whose sum is σ = 144651990. Its totient is φ = 144651988.

The previous prime is 144651979. The next prime is 144652007. The reversal of 144651989 is 989156441.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138062500 + 6589489 = 11750^2 + 2567^2 .

It is a cyclic number.

It is not a de Polignac number, because 144651989 - 2⁴ = 144651973 is a prime.

It is a super-2 number, since 2×144651989² = 41848395843312242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (144651979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72325994 + 72325995.

It is an arithmetic number, because the mean of its divisors is an integer number (72325995).

Almost surely, 2^144651989 is an apocalyptic number.

It is an amenable number.

144651989 is a deficient number, since it is larger than the sum of its proper divisors (1).

144651989 is an equidigital number, since it uses as much as digits as its factorization.

144651989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 47.

The square root of 144651989 is about 12027.1355276308. The cubic root of 144651989 is about 524.9381502346.

It can be divided in two parts, 1446 and 51989, that added together give a palindrome (53435).

The spelling of 144651989 in words is "one hundred forty-four million, six hundred fifty-one thousand, nine hundred eighty-nine".