144623551 has 4 divisors (see below), whose sum is σ = 149610600. Its totient is φ = 139636504.

The previous prime is 144623477. The next prime is 144623569. The reversal of 144623551 is 155326441.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-144623551 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 (144621551) 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, 2493481 + ... + 2493538.

It is an arithmetic number, because the mean of its divisors is an integer number (37402650).

Almost surely, 2^144623551 is an apocalyptic number.

144623551 is a deficient number, since it is larger than the sum of its proper divisors (4987049).

144623551 is an equidigital number, since it uses as much as digits as its factorization.

144623551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4987048.

The product of its digits is 14400, while the sum is 31.

The square root of 144623551 is about 12025.9532262520. The cubic root of 144623551 is about 524.9037477361.

Adding to 144623551 its reverse (155326441), we get a palindrome (299949992).

The spelling of 144623551 in words is "one hundred forty-four million, six hundred twenty-three thousand, five hundred fifty-one".