19154610459109 has 2 divisors, whose sum is σ = 19154610459110. Its totient is φ = 19154610459108.

The previous prime is 19154610459097. The next prime is 19154610459137. The reversal of 19154610459109 is 90195401645191.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17989728444900 + 1164882014209 = 4241430^2 + 1079297^2 .

It is a cyclic number.

It is not a de Polignac number, because 19154610459109 - 2²¹ = 19154608361957 is a prime.

It is a super-2 number, since 2×19154610459109² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19154610459109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19154610456109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9577305229554 + 9577305229555.

It is an arithmetic number, because the mean of its divisors is an integer number (9577305229555).

Almost surely, 2^{19154610459109} is an apocalyptic number.

It is an amenable number.

19154610459109 is a deficient number, since it is larger than the sum of its proper divisors (1).

19154610459109 is an equidigital number, since it uses as much as digits as its factorization.

19154610459109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1749600, while the sum is 55.

The spelling of 19154610459109 in words is "nineteen trillion, one hundred fifty-four billion, six hundred ten million, four hundred fifty-nine thousand, one hundred nine".