19910481453 has 10 divisors (see below), whose sum is σ = 29742818094. Its totient is φ = 13273654248.

The previous prime is 19910481419. The next prime is 19910481457. The reversal of 19910481453 is 35418401991.

19910481453 is a `hidden beast` number, since 1 + 99 + 104 + 8 + 1 + 453 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17939387844 + 1971093609 = 133938^2 + 44397^2 .

It is not a de Polignac number, because 19910481453 - 2⁶ = 19910481389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19910481399 and 19910481408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19910481457) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 122904126 + ... + 122904287.

Almost surely, 2^19910481453 is an apocalyptic number.

It is an amenable number.

19910481453 is a deficient number, since it is larger than the sum of its proper divisors (9832336641).

19910481453 is an equidigital number, since it uses as much as digits as its factorization.

19910481453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245808425 (or 245808416 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The spelling of 19910481453 in words is "nineteen billion, nine hundred ten million, four hundred eighty-one thousand, four hundred fifty-three".