144671721 has 4 divisors (see below), whose sum is σ = 192895632. Its totient is φ = 96447812.

The previous prime is 144671713. The next prime is 144671729. The reversal of 144671721 is 127176441.

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.

It is an interprime number because it is at equal distance from previous prime (144671713) and next prime (144671729).

It is a cyclic number.

It is not a de Polignac number, because 144671721 - 2³ = 144671713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (144671729) 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, 24111951 + ... + 24111956.

It is an arithmetic number, because the mean of its divisors is an integer number (48223908).

Almost surely, 2^144671721 is an apocalyptic number.

It is an amenable number.

144671721 is a deficient number, since it is larger than the sum of its proper divisors (48223911).

144671721 is an equidigital number, since it uses as much as digits as its factorization.

144671721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48223910.

The product of its digits is 9408, while the sum is 33.

The square root of 144671721 is about 12027.9558113588. The cubic root of 144671721 is about 524.9620181139.

The spelling of 144671721 in words is "one hundred forty-four million, six hundred seventy-one thousand, seven hundred twenty-one".