1985458549 has 2 divisors, whose sum is σ = 1985458550. Its totient is φ = 1985458548.

The previous prime is 1985458529. The next prime is 1985458567. The reversal of 1985458549 is 9458545891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1982920900 + 2537649 = 44530^2 + 1593^2 .

It is a cyclic number.

It is not a de Polignac number, because 1985458549 - 2⁹ = 1985458037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1985458493 and 1985458502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1985458529) 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, 992729274 + 992729275.

It is an arithmetic number, because the mean of its divisors is an integer number (992729275).

Almost surely, 2^1985458549 is an apocalyptic number.

It is an amenable number.

1985458549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1985458549 is an equidigital number, since it uses as much as digits as its factorization.

1985458549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368000, while the sum is 58.

The square root of 1985458549 is about 44558.4845904795. The cubic root of 1985458549 is about 1256.8601060691.

The spelling of 1985458549 in words is "one billion, nine hundred eighty-five million, four hundred fifty-eight thousand, five hundred forty-nine".