144740891 has 4 divisors (see below), whose sum is σ = 149409984. Its totient is φ = 140071800.

The previous prime is 144740887. The next prime is 144740923. The reversal of 144740891 is 198047441.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 198047441 = 109 ⋅1816949.

It is a cyclic number.

It is not a de Polignac number, because 144740891 - 2² = 144740887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (144740821) 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, 2334500 + ... + 2334561.

It is an arithmetic number, because the mean of its divisors is an integer number (37352496).

Almost surely, 2^144740891 is an apocalyptic number.

144740891 is a deficient number, since it is larger than the sum of its proper divisors (4669093).

144740891 is an equidigital number, since it uses as much as digits as its factorization.

144740891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4669092.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 144740891 is about 12030.8308524391. The cubic root of 144740891 is about 525.0456691942.

The spelling of 144740891 in words is "one hundred forty-four million, seven hundred forty thousand, eight hundred ninety-one".