1281481193161 has 8 divisors (see below), whose sum is σ = 1406095475400. Its totient is φ = 1160586740352.

The previous prime is 1281481193129. The next prime is 1281481193173. The reversal of 1281481193161 is 1613911841821.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2164110400 + 1279317082761 = 46520^2 + 1131069^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1281481193161 - 2⁵ = 1281481193129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1281481493161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 929956636 + ... + 929958013.

It is an arithmetic number, because the mean of its divisors is an integer number (175761934425).

Almost surely, 2^{1281481193161} is an apocalyptic number.

It is an amenable number.

1281481193161 is a deficient number, since it is larger than the sum of its proper divisors (124614282239).

1281481193161 is a wasteful number, since it uses less digits than its factorization.

1281481193161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1859914715.

The product of its digits is 82944, while the sum is 46.

The spelling of 1281481193161 in words is "one trillion, two hundred eighty-one billion, four hundred eighty-one million, one hundred ninety-three thousand, one hundred sixty-one".