19197561 has 16 divisors (see below), whose sum is σ = 26574464. Its totient is φ = 12317184.

The previous prime is 19197559. The next prime is 19197583. The reversal of 19197561 is 16579191.

It is not a de Polignac number, because 19197561 - 2¹ = 19197559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19197511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9876 + ... + 11658.

It is an arithmetic number, because the mean of its divisors is an integer number (1660904).

Almost surely, 2^19197561 is an apocalyptic number.

It is an amenable number.

19197561 is a deficient number, since it is larger than the sum of its proper divisors (7376903).

19197561 is a wasteful number, since it uses less digits than its factorization.

19197561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1920.

The product of its digits is 17010, while the sum is 39.

The square root of 19197561 is about 4381.5021396777. The cubic root of 19197561 is about 267.7618410321.

The spelling of 19197561 in words is "nineteen million, one hundred ninety-seven thousand, five hundred sixty-one".