1231953928171 has 4 divisors (see below), whose sum is σ = 1237478385472. Its totient is φ = 1226429470872.

The previous prime is 1231953928157. The next prime is 1231953928211. The reversal of 1231953928171 is 1718293591321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1231953928171 - 2¹⁹ = 1231953403883 is a prime.

It is a super-2 number, since 2×1231953928171² (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 (1231953925171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2762228316 + ... + 2762228761.

It is an arithmetic number, because the mean of its divisors is an integer number (309369596368).

Almost surely, 2^{1231953928171} is an apocalyptic number.

1231953928171 is a deficient number, since it is larger than the sum of its proper divisors (5524457301).

1231953928171 is an equidigital number, since it uses as much as digits as its factorization.

1231953928171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5524457300.

The product of its digits is 816480, while the sum is 52.

The spelling of 1231953928171 in words is "one trillion, two hundred thirty-one billion, nine hundred fifty-three million, nine hundred twenty-eight thousand, one hundred seventy-one".