1243376771 has 16 divisors (see below), whose sum is σ = 1539384000. Its totient is φ = 983758464.

The previous prime is 1243376747. The next prime is 1243376789. The reversal of 1243376771 is 1776733421.

It is not a de Polignac number, because 1243376771 - 2¹⁰ = 1243375747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1243376741) 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 15 ways as a sum of consecutive naturals, for example, 25046 + ... + 55803.

It is an arithmetic number, because the mean of its divisors is an integer number (96211500).

Almost surely, 2^1243376771 is an apocalyptic number.

1243376771 is a deficient number, since it is larger than the sum of its proper divisors (296007229).

1243376771 is an frugal number, since it uses more digits than its factorization.

1243376771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80895 (or 80869 counting only the distinct ones).

The product of its digits is 148176, while the sum is 41.

The square root of 1243376771 is about 35261.5480516667. The cubic root of 1243376771 is about 1075.3113995292.

The spelling of 1243376771 in words is "one billion, two hundred forty-three million, three hundred seventy-six thousand, seven hundred seventy-one".