19158461449 has 2 divisors, whose sum is σ = 19158461450. Its totient is φ = 19158461448.

The previous prime is 19158461401. The next prime is 19158461461. The reversal of 19158461449 is 94416485191.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19111127049 + 47334400 = 138243^2 + 6880^2 .

It is a cyclic number.

It is not a de Polignac number, because 19158461449 - 2¹¹ = 19158459401 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19158461396 and 19158461405.

It is not a weakly prime, because it can be changed into another prime (19158461549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9579230724 + 9579230725.

It is an arithmetic number, because the mean of its divisors is an integer number (9579230725).

Almost surely, 2^19158461449 is an apocalyptic number.

It is an amenable number.

19158461449 is a deficient number, since it is larger than the sum of its proper divisors (1).

19158461449 is an equidigital number, since it uses as much as digits as its factorization.

19158461449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1244160, while the sum is 52.

The spelling of 19158461449 in words is "nineteen billion, one hundred fifty-eight million, four hundred sixty-one thousand, four hundred forty-nine".