19552109 has 2 divisors, whose sum is σ = 19552110. Its totient is φ = 19552108.

The previous prime is 19552087. The next prime is 19552123. The reversal of 19552109 is 90125591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18088009 + 1464100 = 4253^2 + 1210^2 .

It is a cyclic number.

It is not a de Polignac number, because 19552109 - 2²⁰ = 18503533 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19552129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9776054 + 9776055.

It is an arithmetic number, because the mean of its divisors is an integer number (9776055).

Almost surely, 2^19552109 is an apocalyptic number.

It is an amenable number.

19552109 is a deficient number, since it is larger than the sum of its proper divisors (1).

19552109 is an equidigital number, since it uses as much as digits as its factorization.

19552109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4050, while the sum is 32.

The square root of 19552109 is about 4421.7766791189. The cubic root of 19552109 is about 269.4001727651.

The spelling of 19552109 in words is "nineteen million, five hundred fifty-two thousand, one hundred nine".