144405551 has 4 divisors (see below), whose sum is σ = 146439504. Its totient is φ = 142371600.

The previous prime is 144405539. The next prime is 144405553. The reversal of 144405551 is 155504441.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155504441 = 4513 ⋅34457.

It is a cyclic number.

It is not a de Polignac number, because 144405551 - 2¹⁰ = 144404527 is a prime.

It is a super-2 number, since 2×144405551² = 41705926319227202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144405553) 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, 1016870 + ... + 1017011.

It is an arithmetic number, because the mean of its divisors is an integer number (36609876).

Almost surely, 2^144405551 is an apocalyptic number.

144405551 is a deficient number, since it is larger than the sum of its proper divisors (2033953).

144405551 is an equidigital number, since it uses as much as digits as its factorization.

144405551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2033952.

The product of its (nonzero) digits is 8000, while the sum is 29.

The square root of 144405551 is about 12016.8860775161. The cubic root of 144405551 is about 524.6398751748.

Adding to 144405551 its reverse (155504441), we get a palindrome (299909992).

It can be divided in two parts, 14440 and 5551, that added together give a palindrome (19991).

The spelling of 144405551 in words is "one hundred forty-four million, four hundred five thousand, five hundred fifty-one".