19798061 has 4 divisors (see below), whose sum is σ = 19830972. Its totient is φ = 19765152.

The previous prime is 19798049. The next prime is 19798067. The reversal of 19798061 is 16089791.

It is a happy number.

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 8702500 + 11095561 = 2950^2 + 3331^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19798061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19798067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15536 + ... + 16761.

It is an arithmetic number, because the mean of its divisors is an integer number (4957743).

Almost surely, 2^19798061 is an apocalyptic number.

It is an amenable number.

19798061 is a deficient number, since it is larger than the sum of its proper divisors (32911).

19798061 is an equidigital number, since it uses as much as digits as its factorization.

19798061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32910.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 19798061 is about 4449.5012080007. The cubic root of 19798061 is about 270.5250915460.

The spelling of 19798061 in words is "nineteen million, seven hundred ninety-eight thousand, sixty-one".