19696961 has 4 divisors (see below), whose sum is σ = 20019924. Its totient is φ = 19374000.

The previous prime is 19696951. The next prime is 19696969. The reversal of 19696961 is 16969691.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4330561 + 15366400 = 2081^2 + 3920^2 .

It is a cyclic number.

It is not a de Polignac number, because 19696961 - 2¹⁰ = 19695937 is a prime.

19696961 is a strobogrammatic number because it is the same when read upside-down.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19696969) 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, 161390 + ... + 161511.

It is an arithmetic number, because the mean of its divisors is an integer number (5004981).

Almost surely, 2^19696961 is an apocalyptic number.

It is an amenable number.

19696961 is a deficient number, since it is larger than the sum of its proper divisors (322963).

19696961 is an equidigital number, since it uses as much as digits as its factorization.

19696961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322962.

The product of its digits is 157464, while the sum is 47.

The square root of 19696961 is about 4438.1258431910. The cubic root of 19696961 is about 270.0638212185.

The spelling of 19696961 in words is "nineteen million, six hundred ninety-six thousand, nine hundred sixty-one".