144672991 has 4 divisors (see below), whose sum is σ = 145481400. Its totient is φ = 143864584.

The previous prime is 144672989. The next prime is 144673019. The reversal of 144672991 is 199276441.

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

It is a cyclic number.

It is not a de Polignac number, because 144672991 - 2¹ = 144672989 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 (144672911) 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, 403936 + ... + 404293.

It is an arithmetic number, because the mean of its divisors is an integer number (36370350).

Almost surely, 2^144672991 is an apocalyptic number.

144672991 is a deficient number, since it is larger than the sum of its proper divisors (808409).

144672991 is an equidigital number, since it uses as much as digits as its factorization.

144672991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808408.

The product of its digits is 108864, while the sum is 43.

The square root of 144672991 is about 12028.0086049188. The cubic root of 144672991 is about 524.9635542349.

The spelling of 144672991 in words is "one hundred forty-four million, six hundred seventy-two thousand, nine hundred ninety-one".