1491891453 has 48 divisors (see below), whose sum is σ = 2415381696. Its totient is φ = 914768640.

The previous prime is 1491891451. The next prime is 1491891463. The reversal of 1491891453 is 3541981941.

1491891453 is a `hidden beast` number, since 14 + 9 + 189 + 1 + 453 = 666.

It is not a de Polignac number, because 1491891453 - 2¹ = 1491891451 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1491891399 and 1491891408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491891451) 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 in 47 ways as a sum of consecutive naturals, for example, 1095493 + ... + 1096853.

It is an arithmetic number, because the mean of its divisors is an integer number (50320452).

Almost surely, 2^1491891453 is an apocalyptic number.

1491891453 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1491891453 is a deficient number, since it is larger than the sum of its proper divisors (923490243).

1491891453 is a wasteful number, since it uses less digits than its factorization.

1491891453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1736 (or 1724 counting only the distinct ones).

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

The square root of 1491891453 is about 38625.0107184451. The cubic root of 1491891453 is about 1142.6478548152.

The spelling of 1491891453 in words is "one billion, four hundred ninety-one million, eight hundred ninety-one thousand, four hundred fifty-three".