1281277801 has 2 divisors, whose sum is σ = 1281277802. Its totient is φ = 1281277800.

The previous prime is 1281277793. The next prime is 1281277817. The reversal of 1281277801 is 1087721821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1136701225 + 144576576 = 33715^2 + 12024^2 .

It is a cyclic number.

It is not a de Polignac number, because 1281277801 - 2³ = 1281277793 is a prime.

It is not a weakly prime, because it can be changed into another prime (1281277831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640638900 + 640638901.

It is an arithmetic number, because the mean of its divisors is an integer number (640638901).

Almost surely, 2^1281277801 is an apocalyptic number.

It is an amenable number.

1281277801 is a deficient number, since it is larger than the sum of its proper divisors (1).

1281277801 is an equidigital number, since it uses as much as digits as its factorization.

1281277801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12544, while the sum is 37.

The square root of 1281277801 is about 35794.9409972974. The cubic root of 1281277801 is about 1086.1282270556.

The spelling of 1281277801 in words is "one billion, two hundred eighty-one million, two hundred seventy-seven thousand, eight hundred one".