1273185161 has 2 divisors, whose sum is σ = 1273185162. Its totient is φ = 1273185160.

The previous prime is 1273185143. The next prime is 1273185167. The reversal of 1273185161 is 1615813721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1207979536 + 65205625 = 34756^2 + 8075^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1273185161 is a prime.

It is not a weakly prime, because it can be changed into another prime (1273185167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 636592580 + 636592581.

It is an arithmetic number, because the mean of its divisors is an integer number (636592581).

Almost surely, 2^1273185161 is an apocalyptic number.

It is an amenable number.

1273185161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1273185161 is an equidigital number, since it uses as much as digits as its factorization.

1273185161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 35.

The square root of 1273185161 is about 35681.7202640231. The cubic root of 1273185161 is about 1083.8367085747.

Adding to 1273185161 its reverse (1615813721), we get a palindrome (2888998882).

The spelling of 1273185161 in words is "one billion, two hundred seventy-three million, one hundred eighty-five thousand, one hundred sixty-one".