1275426161 has 2 divisors, whose sum is σ = 1275426162. Its totient is φ = 1275426160.

The previous prime is 1275426157. The next prime is 1275426193. The reversal of 1275426161 is 1616245721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1255355761 + 20070400 = 35431^2 + 4480^2 .

It is a cyclic number.

It is not a de Polignac number, because 1275426161 - 2² = 1275426157 is a prime.

It is not a weakly prime, because it can be changed into another prime (1275426101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 637713080 + 637713081.

It is an arithmetic number, because the mean of its divisors is an integer number (637713081).

Almost surely, 2^1275426161 is an apocalyptic number.

It is an amenable number.

1275426161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1275426161 is an equidigital number, since it uses as much as digits as its factorization.

1275426161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 35.

The square root of 1275426161 is about 35713.1090917607. The cubic root of 1275426161 is about 1084.4722417935.

The spelling of 1275426161 in words is "one billion, two hundred seventy-five million, four hundred twenty-six thousand, one hundred sixty-one".