1321163731261 has 8 divisors (see below), whose sum is σ = 1447618732704. Its totient is φ = 1195766931120.

The previous prime is 1321163731253. The next prime is 1321163731289. The reversal of 1321163731261 is 1621373611231.

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 1321163731261 - 2³ = 1321163731253 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1321163731261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321163731201) 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, 264547710 + ... + 264552703.

It is an arithmetic number, because the mean of its divisors is an integer number (180952341588).

Almost surely, 2^{1321163731261} is an apocalyptic number.

1321163731261 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1321163731261 is a deficient number, since it is larger than the sum of its proper divisors (126455001443).

1321163731261 is a wasteful number, since it uses less digits than its factorization.

1321163731261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529100651.

The product of its digits is 27216, while the sum is 37.

The spelling of 1321163731261 in words is "one trillion, three hundred twenty-one billion, one hundred sixty-three million, seven hundred thirty-one thousand, two hundred sixty-one".