1281531401 has 2 divisors, whose sum is σ = 1281531402. Its totient is φ = 1281531400.

The previous prime is 1281531379. The next prime is 1281531491. The reversal of 1281531401 is 1041351821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 825068176 + 456463225 = 28724^2 + 21365^2 .

It is a cyclic number.

It is not a de Polignac number, because 1281531401 - 2²² = 1277337097 is a prime.

It is not a weakly prime, because it can be changed into another prime (1281531491) 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, 640765700 + 640765701.

It is an arithmetic number, because the mean of its divisors is an integer number (640765701).

Almost surely, 2^1281531401 is an apocalyptic number.

It is an amenable number.

1281531401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1281531401 is an equidigital number, since it uses as much as digits as its factorization.

1281531401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 1281531401 is about 35798.4832220584. The cubic root of 1281531401 is about 1086.1998805116.

The spelling of 1281531401 in words is "one billion, two hundred eighty-one million, five hundred thirty-one thousand, four hundred one".