144731521 has 8 divisors (see below), whose sum is σ = 158033664. Its totient is φ = 131453520.

The previous prime is 144731519. The next prime is 144731527. The reversal of 144731521 is 125137441.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 144731521 - 2¹ = 144731519 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 144731521.

It is not an unprimeable number, because it can be changed into a prime (144731527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7920 + ... + 18766.

It is an arithmetic number, because the mean of its divisors is an integer number (19754208).

Almost surely, 2^144731521 is an apocalyptic number.

144731521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

144731521 is a deficient number, since it is larger than the sum of its proper divisors (13302143).

144731521 is a wasteful number, since it uses less digits than its factorization.

144731521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12071.

The product of its digits is 3360, while the sum is 28.

The square root of 144731521 is about 12030.4414299726. The cubic root of 144731521 is about 525.0343390993.

Adding to 144731521 its reverse (125137441), we get a palindrome (269868962).

The spelling of 144731521 in words is "one hundred forty-four million, seven hundred thirty-one thousand, five hundred twenty-one".