144230781 has 4 divisors (see below), whose sum is σ = 192307712. Its totient is φ = 96153852.

The previous prime is 144230761. The next prime is 144230789. The reversal of 144230781 is 187032441.

144230781 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 144230781 - 2¹⁸ = 143968637 is a prime.

It is a super-2 number, since 2×144230781² = 41605036375739922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144230789) 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, 24038461 + ... + 24038466.

It is an arithmetic number, because the mean of its divisors is an integer number (48076928).

Almost surely, 2^144230781 is an apocalyptic number.

It is an amenable number.

144230781 is a deficient number, since it is larger than the sum of its proper divisors (48076931).

144230781 is an equidigital number, since it uses as much as digits as its factorization.

144230781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48076930.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 144230781 is about 12009.6120253737. The cubic root of 144230781 is about 524.4281374086.

It can be divided in two parts, 1442 and 30781, that added together give a palindrome (32223).

The spelling of 144230781 in words is "one hundred forty-four million, two hundred thirty thousand, seven hundred eighty-one".