144661891 has 16 divisors (see below), whose sum is σ = 167751648. Its totient is φ = 123289600.

The previous prime is 144661883. The next prime is 144661931. The reversal of 144661891 is 198166441.

It is a cyclic number.

It is not a de Polignac number, because 144661891 - 2³ = 144661883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (144661091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51171 + ... + 53923.

It is an arithmetic number, because the mean of its divisors is an integer number (10484478).

Almost surely, 2^144661891 is an apocalyptic number.

144661891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

144661891 is a deficient number, since it is larger than the sum of its proper divisors (23089757).

144661891 is a wasteful number, since it uses less digits than its factorization.

144661891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3062.

The product of its digits is 41472, while the sum is 40.

The square root of 144661891 is about 12027.5471730524. The cubic root of 144661891 is about 524.9501279912.

The spelling of 144661891 in words is "one hundred forty-four million, six hundred sixty-one thousand, eight hundred ninety-one".