1281381531007 has 24 divisors (see below), whose sum is σ = 1356839076672. Its totient is φ = 1209608562240.

The previous prime is 1281381530999. The next prime is 1281381531013. The reversal of 1281381531007 is 7001351831821.

It is not a de Polignac number, because 1281381531007 - 2³ = 1281381530999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281381531607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8738698 + ... + 8884120.

It is an arithmetic number, because the mean of its divisors is an integer number (56534961528).

Almost surely, 2^{1281381531007} is an apocalyptic number.

1281381531007 is a deficient number, since it is larger than the sum of its proper divisors (75457545665).

1281381531007 is a wasteful number, since it uses less digits than its factorization.

1281381531007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145711 (or 145680 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 40.

The spelling of 1281381531007 in words is "one trillion, two hundred eighty-one billion, three hundred eighty-one million, five hundred thirty-one thousand, seven".