1267613161 has 2 divisors, whose sum is σ = 1267613162. Its totient is φ = 1267613160.

The previous prime is 1267613159. The next prime is 1267613189. The reversal of 1267613161 is 1613167621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 958521600 + 309091561 = 30960^2 + 17581^2 .

It is a cyclic number.

It is not a de Polignac number, because 1267613161 - 2¹ = 1267613159 is a prime.

It is a super-3 number, since 3×1267613161³ (a number of 28 digits) contains 333 as substring.

Together with 1267613159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1267613261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633806580 + 633806581.

It is an arithmetic number, because the mean of its divisors is an integer number (633806581).

Almost surely, 2^1267613161 is an apocalyptic number.

It is an amenable number.

1267613161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1267613161 is an equidigital number, since it uses as much as digits as its factorization.

1267613161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 34.

The square root of 1267613161 is about 35603.5554544767. Note that the first 3 decimals coincide. The cubic root of 1267613161 is about 1082.2532862115.

The spelling of 1267613161 in words is "one billion, two hundred sixty-seven million, six hundred thirteen thousand, one hundred sixty-one".