19090955909 has 2 divisors, whose sum is σ = 19090955910. Its totient is φ = 19090955908.

The previous prime is 19090955899. The next prime is 19090955921. The reversal of 19090955909 is 90955909091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14976374884 + 4114581025 = 122378^2 + 64145^2 .

It is an emirp because it is prime and its reverse (90955909091) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19090955909 - 2¹² = 19090951813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19090955209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9545477954 + 9545477955.

It is an arithmetic number, because the mean of its divisors is an integer number (9545477955).

Almost surely, 2^19090955909 is an apocalyptic number.

It is an amenable number.

19090955909 is a deficient number, since it is larger than the sum of its proper divisors (1).

19090955909 is an equidigital number, since it uses as much as digits as its factorization.

19090955909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1476225, while the sum is 56.

The spelling of 19090955909 in words is "nineteen billion, ninety million, nine hundred fifty-five thousand, nine hundred nine".