1312171780 has 12 divisors (see below), whose sum is σ = 2755560780. Its totient is φ = 524868704.

The previous prime is 1312171771. The next prime is 1312171801. The reversal of 1312171780 is 871712131.

It can be written as a sum of positive squares in 2 ways, for example, as 360696064 + 951475716 = 18992^2 + 30846^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 32804275 + ... + 32804314.

It is an arithmetic number, because the mean of its divisors is an integer number (229630065).

Almost surely, 2^1312171780 is an apocalyptic number.

1312171780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312171780 is an abundant number, since it is smaller than the sum of its proper divisors (1443389000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1312171780 is a wasteful number, since it uses less digits than its factorization.

1312171780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65608598 (or 65608596 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 31.

The square root of 1312171780 is about 36223.9117158818. The cubic root of 1312171780 is about 1094.7885109650.

The spelling of 1312171780 in words is "one billion, three hundred twelve million, one hundred seventy-one thousand, seven hundred eighty".