144709891 has 4 divisors (see below), whose sum is σ = 149377984. Its totient is φ = 140041800.

The previous prime is 144709861. The next prime is 144709927. The reversal of 144709891 is 198907441.

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 144709891 - 2²¹ = 142612739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (144709801) 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, 2334000 + ... + 2334061.

It is an arithmetic number, because the mean of its divisors is an integer number (37344496).

Almost surely, 2^144709891 is an apocalyptic number.

144709891 is a deficient number, since it is larger than the sum of its proper divisors (4668093).

144709891 is an equidigital number, since it uses as much as digits as its factorization.

144709891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4668092.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 144709891 is about 12029.5424268756. The cubic root of 144709891 is about 525.0081824877.

The spelling of 144709891 in words is "one hundred forty-four million, seven hundred nine thousand, eight hundred ninety-one".