144711981 has 16 divisors (see below), whose sum is σ = 216289920. Its totient is φ = 95618880.

The previous prime is 144711977. The next prime is 144711989. The reversal of 144711981 is 189117441.

It is a happy number.

It is not a de Polignac number, because 144711981 - 2² = 144711977 is a prime.

It is a super-2 number, since 2×144711981² = 41883114889888722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144711989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20665 + ... + 26766.

It is an arithmetic number, because the mean of its divisors is an integer number (13518120).

Almost surely, 2^144711981 is an apocalyptic number.

It is an amenable number.

144711981 is a deficient number, since it is larger than the sum of its proper divisors (71577939).

144711981 is a wasteful number, since it uses less digits than its factorization.

144711981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47553 (or 47547 counting only the distinct ones).

The product of its digits is 8064, while the sum is 36.

The square root of 144711981 is about 12029.6292960340. The cubic root of 144711981 is about 525.0107099856.

The spelling of 144711981 in words is "one hundred forty-four million, seven hundred eleven thousand, nine hundred eighty-one".