19212631691 has 8 divisors (see below), whose sum is σ = 20960305200. Its totient is φ = 17465136640.

The previous prime is 19212631681. The next prime is 19212631769. The reversal of 19212631691 is 19613621291.

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

It is a cyclic number.

It is not a de Polignac number, because 19212631691 - 2¹⁰ = 19212630667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19212631601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 288995 + ... + 349203.

It is an arithmetic number, because the mean of its divisors is an integer number (2620038150).

Almost surely, 2^19212631691 is an apocalyptic number.

19212631691 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19212631691 is a deficient number, since it is larger than the sum of its proper divisors (1747673509).

19212631691 is a wasteful number, since it uses less digits than its factorization.

19212631691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89229.

The product of its digits is 34992, while the sum is 41.

The spelling of 19212631691 in words is "nineteen billion, two hundred twelve million, six hundred thirty-one thousand, six hundred ninety-one".