1549627649 has 2 divisors, whose sum is σ = 1549627650. Its totient is φ = 1549627648.

The previous prime is 1549627643. The next prime is 1549627663. The reversal of 1549627649 is 9467269451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 820249600 + 729378049 = 28640^2 + 27007^2 .

It is a cyclic number.

It is not a de Polignac number, because 1549627649 - 2²⁰ = 1548579073 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1549627649.

It is not a weakly prime, because it can be changed into another prime (1549627643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 774813824 + 774813825.

It is an arithmetic number, because the mean of its divisors is an integer number (774813825).

Almost surely, 2^1549627649 is an apocalyptic number.

It is an amenable number.

1549627649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1549627649 is an equidigital number, since it uses as much as digits as its factorization.

1549627649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3265920, while the sum is 53.

The square root of 1549627649 is about 39365.3102235966. The cubic root of 1549627649 is about 1157.2018489220.

The spelling of 1549627649 in words is "one billion, five hundred forty-nine million, six hundred twenty-seven thousand, six hundred forty-nine".