144985681 has 3 divisors (see below), whose sum is σ = 144997723. Its totient is φ = 144973640.

The previous prime is 144985663. The next prime is 144985693. The reversal of 144985681 is 186589441.

The square root of 144985681 is 12041.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 186589441 = 1223 ⋅152567.

It can be written as a sum of positive squares in only one way, i.e., 91987281 + 52998400 = 9591^2 + 7280^2 .

It is not a de Polignac number, because 144985681 - 2⁵ = 144985649 is a prime.

It is a super-2 number, since 2×144985681² = 42041695390067522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (144985651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 6021 + ... + 18061.

Almost surely, 2^144985681 is an apocalyptic number.

144985681 is the 12041-st square number.

144985681 is the 6021-st centered octagonal number.

It is an amenable number.

144985681 is a deficient number, since it is larger than the sum of its proper divisors (12042).

144985681 is an frugal number, since it uses more digits than its factorization.

144985681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24082 (or 12041 counting only the distinct ones).

The product of its digits is 276480, while the sum is 46.

The cubic root of 144985681 is about 525.3414933180.

The spelling of 144985681 in words is "one hundred forty-four million, nine hundred eighty-five thousand, six hundred eighty-one".