1891489471 has 2 divisors, whose sum is σ = 1891489472. Its totient is φ = 1891489470.

The previous prime is 1891489421. The next prime is 1891489511. The reversal of 1891489471 is 1749841981.

It is a strong prime.

It is an emirp because it is prime and its reverse (1749841981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1891489471 - 2¹⁹ = 1890965183 is a prime.

It is a super-3 number, since 3×1891489471³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1891489421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 945744735 + 945744736.

It is an arithmetic number, because the mean of its divisors is an integer number (945744736).

Almost surely, 2^1891489471 is an apocalyptic number.

1891489471 is a deficient number, since it is larger than the sum of its proper divisors (1).

1891489471 is an equidigital number, since it uses as much as digits as its factorization.

1891489471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 52.

The square root of 1891489471 is about 43491.2574088172. The cubic root of 1891489471 is about 1236.7102948680.

The spelling of 1891489471 in words is "one billion, eight hundred ninety-one million, four hundred eighty-nine thousand, four hundred seventy-one".