144536921 has 4 divisors (see below), whose sum is σ = 144678144. Its totient is φ = 144395700.

The previous prime is 144536897. The next prime is 144536927. The reversal of 144536921 is 129635441.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 129635441 = 13 ⋅9971957.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-144536921 is a prime.

It is a super-3 number, since 3×144536921³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (144536927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69065 + ... + 71126.

It is an arithmetic number, because the mean of its divisors is an integer number (36169536).

Almost surely, 2^144536921 is an apocalyptic number.

It is an amenable number.

144536921 is a deficient number, since it is larger than the sum of its proper divisors (141223).

144536921 is a wasteful number, since it uses less digits than its factorization.

144536921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141222.

The product of its digits is 25920, while the sum is 35.

The square root of 144536921 is about 12022.3508932322. The cubic root of 144536921 is about 524.7989204247.

The spelling of 144536921 in words is "one hundred forty-four million, five hundred thirty-six thousand, nine hundred twenty-one".