1281521371171 has 8 divisors (see below), whose sum is σ = 1283782833504. Its totient is φ = 1279260776640.

The previous prime is 1281521371159. The next prime is 1281521371177. The reversal of 1281521371171 is 1711731251821.

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

It is a cyclic number.

It is not a de Polignac number, because 1281521371171 - 2³¹ = 1279373887523 is a prime.

It is a super-2 number, since 2×1281521371171² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1281521371177) 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 in 7 ways as a sum of consecutive naturals, for example, 2775471 + ... + 3204103.

It is an arithmetic number, because the mean of its divisors is an integer number (160472854188).

Almost surely, 2^{1281521371171} is an apocalyptic number.

1281521371171 is a deficient number, since it is larger than the sum of its proper divisors (2261462333).

1281521371171 is an equidigital number, since it uses as much as digits as its factorization.

1281521371171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433901.

The product of its digits is 23520, while the sum is 40.

The spelling of 1281521371171 in words is "one trillion, two hundred eighty-one billion, five hundred twenty-one million, three hundred seventy-one thousand, one hundred seventy-one".