1281407951 has 2 divisors, whose sum is σ = 1281407952. Its totient is φ = 1281407950.

The previous prime is 1281407923. The next prime is 1281407999. The reversal of 1281407951 is 1597041821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1281407951 - 2¹⁴ = 1281391567 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1281407651) 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, 640703975 + 640703976.

It is an arithmetic number, because the mean of its divisors is an integer number (640703976).

Almost surely, 2^1281407951 is an apocalyptic number.

1281407951 is a deficient number, since it is larger than the sum of its proper divisors (1).

1281407951 is an equidigital number, since it uses as much as digits as its factorization.

1281407951 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 38.

The square root of 1281407951 is about 35796.7589454688. The cubic root of 1281407951 is about 1086.1650014908.

The spelling of 1281407951 in words is "one billion, two hundred eighty-one million, four hundred seven thousand, nine hundred fifty-one".