1288637401 has 2 divisors, whose sum is σ = 1288637402. Its totient is φ = 1288637400.

The previous prime is 1288637381. The next prime is 1288637461. The reversal of 1288637401 is 1047368821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1287087376 + 1550025 = 35876^2 + 1245^2 .

It is a cyclic number.

It is not a de Polignac number, because 1288637401 - 2⁹ = 1288636889 is a prime.

It is not a weakly prime, because it can be changed into another prime (1288637461) 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, 644318700 + 644318701.

It is an arithmetic number, because the mean of its divisors is an integer number (644318701).

Almost surely, 2^1288637401 is an apocalyptic number.

It is an amenable number.

1288637401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1288637401 is an equidigital number, since it uses as much as digits as its factorization.

1288637401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 1288637401 is about 35897.5960337179. The cubic root of 1288637401 is about 1088.2038147335.

The spelling of 1288637401 in words is "one billion, two hundred eighty-eight million, six hundred thirty-seven thousand, four hundred one".