1956647137 has 2 divisors, whose sum is σ = 1956647138. Its totient is φ = 1956647136.

The previous prime is 1956647131. The next prime is 1956647159. The reversal of 1956647137 is 7317466591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1331447121 + 625200016 = 36489^2 + 25004^2 .

It is an emirp because it is prime and its reverse (7317466591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1956647137 - 2³ = 1956647129 is a prime.

It is not a weakly prime, because it can be changed into another prime (1956647131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 978323568 + 978323569.

It is an arithmetic number, because the mean of its divisors is an integer number (978323569).

Almost surely, 2^1956647137 is an apocalyptic number.

It is an amenable number.

1956647137 is a deficient number, since it is larger than the sum of its proper divisors (1).

1956647137 is an equidigital number, since it uses as much as digits as its factorization.

1956647137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 952560, while the sum is 49.

The square root of 1956647137 is about 44234.0043066417. The cubic root of 1956647137 is about 1250.7509380100.

The spelling of 1956647137 in words is "one billion, nine hundred fifty-six million, six hundred forty-seven thousand, one hundred thirty-seven".