144145621 has 4 divisors (see below), whose sum is σ = 144454752. Its totient is φ = 143836492.

The previous prime is 144145619. The next prime is 144145649. The reversal of 144145621 is 126541441.

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: 126541441 = 13 ⋅9733957.

It is a cyclic number.

It is not a de Polignac number, because 144145621 - 2¹ = 144145619 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 144145621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144143621) 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, 153865 + ... + 154798.

It is an arithmetic number, because the mean of its divisors is an integer number (36113688).

Almost surely, 2^144145621 is an apocalyptic number.

It is an amenable number.

144145621 is a deficient number, since it is larger than the sum of its proper divisors (309131).

144145621 is an equidigital number, since it uses as much as digits as its factorization.

144145621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309130.

The product of its digits is 3840, while the sum is 28.

The square root of 144145621 is about 12006.0660084809. The cubic root of 144145621 is about 524.3249021803.

The spelling of 144145621 in words is "one hundred forty-four million, one hundred forty-five thousand, six hundred twenty-one".