19620912097 has 4 divisors (see below), whose sum is σ = 19621201860. Its totient is φ = 19620622336.

The previous prime is 19620912079. The next prime is 19620912137. The reversal of 19620912097 is 79021902691.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 9217728081 + 10403184016 = 96009^2 + 101996^2 .

It is a cyclic number.

It is not a de Polignac number, because 19620912097 - 2²⁷ = 19486694369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19620912007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16929 + ... + 198817.

It is an arithmetic number, because the mean of its divisors is an integer number (4905300465).

Almost surely, 2^19620912097 is an apocalyptic number.

It is an amenable number.

19620912097 is a deficient number, since it is larger than the sum of its proper divisors (289763).

19620912097 is a wasteful number, since it uses less digits than its factorization.

19620912097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289762.

The product of its (nonzero) digits is 122472, while the sum is 46.

The spelling of 19620912097 in words is "nineteen billion, six hundred twenty million, nine hundred twelve thousand, ninety-seven".