19974161 has 4 divisors (see below), whose sum is σ = 20118000. Its totient is φ = 19830324.

The previous prime is 19974139. The next prime is 19974169. The reversal of 19974161 is 16147991.

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 19974161 - 2¹⁰ = 19973137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19974169) 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, 71711 + ... + 71988.

It is an arithmetic number, because the mean of its divisors is an integer number (5029500).

Almost surely, 2^19974161 is an apocalyptic number.

It is an amenable number.

19974161 is a deficient number, since it is larger than the sum of its proper divisors (143839).

19974161 is a wasteful number, since it uses less digits than its factorization.

19974161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143838.

The product of its digits is 13608, while the sum is 38.

The square root of 19974161 is about 4469.2461332981. The cubic root of 19974161 is about 271.3248148872.

The spelling of 19974161 in words is "nineteen million, nine hundred seventy-four thousand, one hundred sixty-one".