1281461387 has 2 divisors, whose sum is σ = 1281461388. Its totient is φ = 1281461386.

The previous prime is 1281461381. The next prime is 1281461407. The reversal of 1281461387 is 7831641821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1281461387 - 2⁶ = 1281461323 is a prime.

It is not a weakly prime, because it can be changed into another prime (1281461381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640730693 + 640730694.

It is an arithmetic number, because the mean of its divisors is an integer number (640730694).

Almost surely, 2^1281461387 is an apocalyptic number.

1281461387 is a deficient number, since it is larger than the sum of its proper divisors (1).

1281461387 is an equidigital number, since it uses as much as digits as its factorization.

1281461387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 41.

The square root of 1281461387 is about 35797.5053181084. The cubic root of 1281461387 is about 1086.1800993385.

The spelling of 1281461387 in words is "one billion, two hundred eighty-one million, four hundred sixty-one thousand, three hundred eighty-seven".