144918931 has 4 divisors (see below), whose sum is σ = 153443592. Its totient is φ = 136394272.

The previous prime is 144918919. The next prime is 144918953. The reversal of 144918931 is 139819441.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 139819441 = 17 ⋅8224673.

It is a cyclic number.

It is not a de Polignac number, because 144918931 - 2⁷ = 144918803 is a prime.

It is a super-2 number, since 2×144918931² = 42002993124365522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (144918971) 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, 4262305 + ... + 4262338.

It is an arithmetic number, because the mean of its divisors is an integer number (38360898).

Almost surely, 2^144918931 is an apocalyptic number.

144918931 is a deficient number, since it is larger than the sum of its proper divisors (8524661).

144918931 is an equidigital number, since it uses as much as digits as its factorization.

144918931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8524660.

The product of its digits is 31104, while the sum is 40.

The square root of 144918931 is about 12038.2279011489. The cubic root of 144918931 is about 525.2608602347.

The spelling of 144918931 in words is "one hundred forty-four million, nine hundred eighteen thousand, nine hundred thirty-one".