1271920823 has 2 divisors, whose sum is σ = 1271920824. Its totient is φ = 1271920822.

The previous prime is 1271920799. The next prime is 1271920873. The reversal of 1271920823 is 3280291721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1271920823 - 2¹⁶ = 1271855287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1271920873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 635960411 + 635960412.

It is an arithmetic number, because the mean of its divisors is an integer number (635960412).

Almost surely, 2^1271920823 is an apocalyptic number.

1271920823 is a deficient number, since it is larger than the sum of its proper divisors (1).

1271920823 is an equidigital number, since it uses as much as digits as its factorization.

1271920823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 1271920823 is about 35663.9989765590. The cubic root of 1271920823 is about 1083.4778213174.

The spelling of 1271920823 in words is "one billion, two hundred seventy-one million, nine hundred twenty thousand, eight hundred twenty-three".