144015991 has 16 divisors (see below), whose sum is σ = 176198400. Its totient is φ = 114956928.

The previous prime is 144015983. The next prime is 144016003. The reversal of 144015991 is 199510441.

It is a cyclic number.

It is not a de Polignac number, because 144015991 - 2³ = 144015983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144015961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1330 + ... + 17023.

It is an arithmetic number, because the mean of its divisors is an integer number (11012400).

Almost surely, 2^144015991 is an apocalyptic number.

144015991 is a deficient number, since it is larger than the sum of its proper divisors (32182409).

144015991 is a wasteful number, since it uses less digits than its factorization.

144015991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18438.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 144015991 is about 12000.6662731700. Note that the first 3 decimals coincide. The cubic root of 144015991 is about 524.1676801031.

The spelling of 144015991 in words is "one hundred forty-four million, fifteen thousand, nine hundred ninety-one".