144721855 has 4 divisors (see below), whose sum is σ = 173666232. Its totient is φ = 115777480.

The previous prime is 144721849. The next prime is 144721877. The reversal of 144721855 is 558127441.

144721855 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 144721855 - 2³ = 144721847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14472181 + ... + 14472190.

It is an arithmetic number, because the mean of its divisors is an integer number (43416558).

Almost surely, 2^144721855 is an apocalyptic number.

144721855 is a deficient number, since it is larger than the sum of its proper divisors (28944377).

144721855 is an equidigital number, since it uses as much as digits as its factorization.

144721855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28944376.

The product of its digits is 44800, while the sum is 37.

The square root of 144721855 is about 12030.0396923701. The cubic root of 144721855 is about 525.0226505723.

The spelling of 144721855 in words is "one hundred forty-four million, seven hundred twenty-one thousand, eight hundred fifty-five".