1891129648 has 20 divisors (see below), whose sum is σ = 3665243088. Its totient is φ = 945260480.

The previous prime is 1891129619. The next prime is 1891129649. The reversal of 1891129648 is 8469211981.

It is not an unprimeable number, because it can be changed into a prime (1891129649) 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 3 ways as a sum of consecutive naturals, for example, 37293 + ... + 71923.

Almost surely, 2^1891129648 is an apocalyptic number.

It is an amenable number.

1891129648 is a deficient number, since it is larger than the sum of its proper divisors (1774113440).

1891129648 is a wasteful number, since it uses less digits than its factorization.

1891129648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38052 (or 38046 counting only the distinct ones).

The product of its digits is 248832, while the sum is 49.

The square root of 1891129648 is about 43487.1204841158. The cubic root of 1891129648 is about 1236.6318690144.

The spelling of 1891129648 in words is "one billion, eight hundred ninety-one million, one hundred twenty-nine thousand, six hundred forty-eight".