19397161 has 4 divisors (see below), whose sum is σ = 22168192. Its totient is φ = 16626132.

The previous prime is 19397123. The next prime is 19397173. The reversal of 19397161 is 16179391.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19397161 - 2¹³ = 19388969 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19397161.

It is not an unprimeable number, because it can be changed into a prime (19397111) 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, 1385505 + ... + 1385518.

It is an arithmetic number, because the mean of its divisors is an integer number (5542048).

Almost surely, 2^19397161 is an apocalyptic number.

It is an amenable number.

19397161 is a deficient number, since it is larger than the sum of its proper divisors (2771031).

19397161 is an equidigital number, since it uses as much as digits as its factorization.

19397161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2771030.

The product of its digits is 10206, while the sum is 37.

The square root of 19397161 is about 4404.2208164442. The cubic root of 19397161 is about 268.6866303808.

The spelling of 19397161 in words is "nineteen million, three hundred ninety-seven thousand, one hundred sixty-one".