19891009352 has 8 divisors (see below), whose sum is σ = 37295642550. Its totient is φ = 9945504672.

The previous prime is 19891009301. The next prime is 19891009363. The reversal of 19891009352 is 25390019891.

It can be written as a sum of positive squares in only one way, i.e., 11490553636 + 8400455716 = 107194^2 + 91654^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 19891009297 and 19891009306.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1243188077 + ... + 1243188092.

Almost surely, 2^19891009352 is an apocalyptic number.

It is an amenable number.

19891009352 is a deficient number, since it is larger than the sum of its proper divisors (17404633198).

19891009352 is a wasteful number, since it uses less digits than its factorization.

19891009352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2486376175 (or 2486376171 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 47.

The spelling of 19891009352 in words is "nineteen billion, eight hundred ninety-one million, nine thousand, three hundred fifty-two".