891144429 has 24 divisors (see below), whose sum is σ = 1392158880. Its totient is φ = 505550304.

The previous prime is 891144409. The next prime is 891144461. The reversal of 891144429 is 924441198.

It is a happy number.

It is not a de Polignac number, because 891144429 - 2¹⁹ = 890620141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891144409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1374 + ... + 42239.

It is an arithmetic number, because the mean of its divisors is an integer number (58006620).

Almost surely, 2^891144429 is an apocalyptic number.

It is an amenable number.

891144429 is a deficient number, since it is larger than the sum of its proper divisors (501014451).

891144429 is a wasteful number, since it uses less digits than its factorization.

891144429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43769 (or 43762 counting only the distinct ones).

The product of its digits is 82944, while the sum is 42.

The square root of 891144429 is about 29852.0422919438. The cubic root of 891144429 is about 962.3122895652.

The spelling of 891144429 in words is "eight hundred ninety-one million, one hundred forty-four thousand, four hundred twenty-nine".