1288631401 has 2 divisors, whose sum is σ = 1288631402. Its totient is φ = 1288631400.

The previous prime is 1288631371. The next prime is 1288631447. The reversal of 1288631401 is 1041368821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1055275225 + 233356176 = 32485^2 + 15276^2 .

It is a cyclic number.

It is not a de Polignac number, because 1288631401 - 2⁵ = 1288631369 is a prime.

It is not a weakly prime, because it can be changed into another prime (1288637401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 644315700 + 644315701.

It is an arithmetic number, because the mean of its divisors is an integer number (644315701).

Almost surely, 2^1288631401 is an apocalyptic number.

It is an amenable number.

1288631401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1288631401 is an equidigital number, since it uses as much as digits as its factorization.

1288631401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 1288631401 is about 35897.5124625649. The cubic root of 1288631401 is about 1088.2021258092.

The spelling of 1288631401 in words is "one billion, two hundred eighty-eight million, six hundred thirty-one thousand, four hundred one".