144773861 has 4 divisors (see below), whose sum is σ = 144811500. Its totient is φ = 144736224.

The previous prime is 144773857. The next prime is 144773879. The reversal of 144773861 is 168377441.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 168377441 = 9721 ⋅17321.

It can be written as a sum of positive squares in 2 ways, for example, as 3876961 + 140896900 = 1969^2 + 11870^2 .

It is a cyclic number.

It is not a de Polignac number, because 144773861 - 2² = 144773857 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 (144773821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12296 + ... + 20993.

It is an arithmetic number, because the mean of its divisors is an integer number (36202875).

Almost surely, 2^144773861 is an apocalyptic number.

It is an amenable number.

144773861 is a deficient number, since it is larger than the sum of its proper divisors (37639).

144773861 is an equidigital number, since it uses as much as digits as its factorization.

144773861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37638.

The product of its digits is 112896, while the sum is 41.

The square root of 144773861 is about 12032.2010039726. The cubic root of 144773861 is about 525.0855322474.

The spelling of 144773861 in words is "one hundred forty-four million, seven hundred seventy-three thousand, eight hundred sixty-one".