1990895453 has 2 divisors, whose sum is σ = 1990895454. Its totient is φ = 1990895452.

The previous prime is 1990895441. The next prime is 1990895461. The reversal of 1990895453 is 3545980991.

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., 1590175129 + 400720324 = 39877^2 + 20018^2 .

It is a cyclic number.

It is not a de Polignac number, because 1990895453 - 2¹⁶ = 1990829917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1990895395 and 1990895404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1990895953) 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, 995447726 + 995447727.

It is an arithmetic number, because the mean of its divisors is an integer number (995447727).

Almost surely, 2^1990895453 is an apocalyptic number.

It is an amenable number.

1990895453 is a deficient number, since it is larger than the sum of its proper divisors (1).

1990895453 is an equidigital number, since it uses as much as digits as its factorization.

1990895453 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1749600, while the sum is 53.

The square root of 1990895453 is about 44619.4515094034. The cubic root of 1990895453 is about 1258.0063064011.

The spelling of 1990895453 in words is "one billion, nine hundred ninety million, eight hundred ninety-five thousand, four hundred fifty-three".