144681643 has 2 divisors, whose sum is σ = 144681644. Its totient is φ = 144681642.

The previous prime is 144681617. The next prime is 144681673. The reversal of 144681643 is 346186441.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-144681643 is a prime.

It is not a weakly prime, because it can be changed into another prime (144681673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72340821 + 72340822.

It is an arithmetic number, because the mean of its divisors is an integer number (72340822).

Almost surely, 2^144681643 is an apocalyptic number.

144681643 is a deficient number, since it is larger than the sum of its proper divisors (1).

144681643 is an equidigital number, since it uses as much as digits as its factorization.

144681643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 37.

The square root of 144681643 is about 12028.3682600758. The cubic root of 144681643 is about 524.9740189713.

The spelling of 144681643 in words is "one hundred forty-four million, six hundred eighty-one thousand, six hundred forty-three".