1549493977 has 2 divisors, whose sum is σ = 1549493978. Its totient is φ = 1549493976.

The previous prime is 1549493971. The next prime is 1549494013. The reversal of 1549493977 is 7793949451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1481942016 + 67551961 = 38496^2 + 8219^2 .

It is a cyclic number.

It is not a de Polignac number, because 1549493977 - 2¹¹ = 1549491929 is a prime.

It is not a weakly prime, because it can be changed into another prime (1549493971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 774746988 + 774746989.

It is an arithmetic number, because the mean of its divisors is an integer number (774746989).

Almost surely, 2^1549493977 is an apocalyptic number.

It is an amenable number.

1549493977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1549493977 is an equidigital number, since it uses as much as digits as its factorization.

1549493977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8573040, while the sum is 58.

The square root of 1549493977 is about 39363.6123469379. The cubic root of 1549493977 is about 1157.1685742762.

The spelling of 1549493977 in words is "one billion, five hundred forty-nine million, four hundred ninety-three thousand, nine hundred seventy-seven".