19491998522 has 8 divisors (see below), whose sum is σ = 29245661172. Its totient is φ = 9743444800.

The previous prime is 19491998507. The next prime is 19491998543. The reversal of 19491998522 is 22589919491.

It can be written as a sum of positive squares in 2 ways, for example, as 15013845961 + 4478152561 = 122531^2 + 66919^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1267679 + ... + 1282962.

Almost surely, 2^19491998522 is an apocalyptic number.

19491998522 is a deficient number, since it is larger than the sum of its proper divisors (9753662650).

19491998522 is a wasteful number, since it uses less digits than its factorization.

19491998522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2554464.

The product of its digits is 4199040, while the sum is 59.

The spelling of 19491998522 in words is "nineteen billion, four hundred ninety-one million, nine hundred ninety-eight thousand, five hundred twenty-two".