144421551 has 6 divisors (see below), whose sum is σ = 208608920. Its totient is φ = 96281028.

The previous prime is 144421547. The next prime is 144421561. The reversal of 144421551 is 155124441.

144421551 is a `hidden beast` number, since 1 + 444 + 215 + 5 + 1 = 666.

It is not a de Polignac number, because 144421551 - 2² = 144421547 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144421561) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8023411 + ... + 8023428.

Almost surely, 2^144421551 is an apocalyptic number.

144421551 is a deficient number, since it is larger than the sum of its proper divisors (64187369).

144421551 is a wasteful number, since it uses less digits than its factorization.

144421551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16046845 (or 16046842 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

The square root of 144421551 is about 12017.5517889460. The cubic root of 144421551 is about 524.6592509950.

Adding to 144421551 its reverse (155124441), we get a palindrome (299545992).

The spelling of 144421551 in words is "one hundred forty-four million, four hundred twenty-one thousand, five hundred fifty-one".