1280601961 has 2 divisors, whose sum is σ = 1280601962. Its totient is φ = 1280601960.

The previous prime is 1280601947. The next prime is 1280602009. The reversal of 1280601961 is 1691060821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1257127936 + 23474025 = 35456^2 + 4845^2 .

It is a cyclic number.

It is not a de Polignac number, because 1280601961 - 2¹¹ = 1280599913 is a prime.

It is not a weakly prime, because it can be changed into another prime (1280601911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640300980 + 640300981.

It is an arithmetic number, because the mean of its divisors is an integer number (640300981).

Almost surely, 2^1280601961 is an apocalyptic number.

It is an amenable number.

1280601961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280601961 is an equidigital number, since it uses as much as digits as its factorization.

1280601961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 1280601961 is about 35785.4993118721. The cubic root of 1280601961 is about 1085.9372255408.

The spelling of 1280601961 in words is "one billion, two hundred eighty million, six hundred one thousand, nine hundred sixty-one".