144167991 has 24 divisors (see below), whose sum is σ = 222418560. Its totient is φ = 82771920.

The previous prime is 144167971. The next prime is 144168023. The reversal of 144167991 is 199761441.

It is not a de Polignac number, because 144167991 - 2¹¹ = 144165943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144167971) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3555 + ... + 17348.

It is an arithmetic number, because the mean of its divisors is an integer number (9267440).

Almost surely, 2^144167991 is an apocalyptic number.

144167991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

144167991 is a deficient number, since it is larger than the sum of its proper divisors (78250569).

144167991 is a wasteful number, since it uses less digits than its factorization.

144167991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20947 (or 20936 counting only the distinct ones).

The product of its digits is 54432, while the sum is 42.

The square root of 144167991 is about 12006.9975847420. The cubic root of 144167991 is about 524.3520241543.

The spelling of 144167991 in words is "one hundred forty-four million, one hundred sixty-seven thousand, nine hundred ninety-one".