1843749491 has 2 divisors, whose sum is σ = 1843749492. Its totient is φ = 1843749490.

The previous prime is 1843749473. The next prime is 1843749499. The reversal of 1843749491 is 1949473481.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1843749491 is a prime.

It is a super-3 number, since 3×1843749491³ (a number of 29 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1843749499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 921874745 + 921874746.

It is an arithmetic number, because the mean of its divisors is an integer number (921874746).

Almost surely, 2^1843749491 is an apocalyptic number.

1843749491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1843749491 is an equidigital number, since it uses as much as digits as its factorization.

1843749491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 50.

The square root of 1843749491 is about 42938.9041662686. The cubic root of 1843749491 is about 1226.2169200413.

The spelling of 1843749491 in words is "one billion, eight hundred forty-three million, seven hundred forty-nine thousand, four hundred ninety-one".