19381951445 has 4 divisors (see below), whose sum is σ = 23258341740. Its totient is φ = 15505561152.

The previous prime is 19381951429. The next prime is 19381951469. The reversal of 19381951445 is 54415918391.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54415918391 = 29 ⋅1876410979.

It can be written as a sum of positive squares in 2 ways, for example, as 13624025284 + 5757926161 = 116722^2 + 75881^2 .

It is a cyclic number.

It is not a de Polignac number, because 19381951445 - 2⁴ = 19381951429 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19381951393 and 19381951402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1938195140 + ... + 1938195149.

It is an arithmetic number, because the mean of its divisors is an integer number (5814585435).

Almost surely, 2^19381951445 is an apocalyptic number.

It is an amenable number.

19381951445 is a deficient number, since it is larger than the sum of its proper divisors (3876390295).

19381951445 is an equidigital number, since it uses as much as digits as its factorization.

19381951445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3876390294.

The product of its digits is 777600, while the sum is 50.

The spelling of 19381951445 in words is "nineteen billion, three hundred eighty-one million, nine hundred fifty-one thousand, four hundred forty-five".