144639431 has 4 divisors (see below), whose sum is σ = 148167264. Its totient is φ = 141111600.

The previous prime is 144639421. The next prime is 144639437. The reversal of 144639431 is 134936441.

144639431 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 an emirpimes, since its reverse is a distinct semiprime: 134936441 = 109 ⋅1237949.

It is a cyclic number.

It is not a de Polignac number, because 144639431 - 2⁶ = 144639367 is a prime.

It is a super-2 number, since 2×144639431² = 41841130000007522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 144639391 and 144639400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144639437) 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, 1763855 + ... + 1763936.

It is an arithmetic number, because the mean of its divisors is an integer number (37041816).

Almost surely, 2^144639431 is an apocalyptic number.

144639431 is a deficient number, since it is larger than the sum of its proper divisors (3527833).

144639431 is an equidigital number, since it uses as much as digits as its factorization.

144639431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3527832.

The product of its digits is 31104, while the sum is 35.

The square root of 144639431 is about 12026.6134468519. The cubic root of 144639431 is about 524.9229589144.

The spelling of 144639431 in words is "one hundred forty-four million, six hundred thirty-nine thousand, four hundred thirty-one".