144551021 has 4 divisors (see below), whose sum is σ = 150835872. Its totient is φ = 138266172.

The previous prime is 144550957. The next prime is 144551059. The reversal of 144551021 is 120155441.

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: 120155441 = 7 ⋅17165063.

It is a cyclic number.

It is not a de Polignac number, because 144551021 - 2⁶ = 144550957 is a prime.

It is a super-5 number, since 5×144551021⁵ (a number of 42 digits) contains 55555 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 6284827 = 144551021 / (1 + 4 + 4 + 5 + 5 + 1 + 0 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144551321) 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, 3142391 + ... + 3142436.

It is an arithmetic number, because the mean of its divisors is an integer number (37708968).

Almost surely, 2^144551021 is an apocalyptic number.

It is an amenable number.

144551021 is a deficient number, since it is larger than the sum of its proper divisors (6284851).

144551021 is an equidigital number, since it uses as much as digits as its factorization.

144551021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6284850.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 144551021 is about 12022.9372867033. The cubic root of 144551021 is about 524.8159850937.

The spelling of 144551021 in words is "one hundred forty-four million, five hundred fifty-one thousand, twenty-one".