19269090409981 has 2 divisors, whose sum is σ = 19269090409982. Its totient is φ = 19269090409980.

The previous prime is 19269090409979. The next prime is 19269090409991. The reversal of 19269090409981 is 18990409096291.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15332636007481 + 3936454402500 = 3915691^2 + 1984050^2 .

It is a cyclic number.

It is not a de Polignac number, because 19269090409981 - 2¹ = 19269090409979 is a prime.

It is a super-2 number, since 2×19269090409981² (a number of 27 digits) contains 22 as substring.

Together with 19269090409979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19269090409951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9634545204990 + 9634545204991.

It is an arithmetic number, because the mean of its divisors is an integer number (9634545204991).

Almost surely, 2^{19269090409981} is an apocalyptic number.

It is an amenable number.

19269090409981 is a deficient number, since it is larger than the sum of its proper divisors (1).

19269090409981 is an equidigital number, since it uses as much as digits as its factorization.

19269090409981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22674816, while the sum is 67.

The spelling of 19269090409981 in words is "nineteen trillion, two hundred sixty-nine billion, ninety million, four hundred nine thousand, nine hundred eighty-one".