1312161020 has 12 divisors (see below), whose sum is σ = 2755538184. Its totient is φ = 524864400.

The previous prime is 1312160989. The next prime is 1312161029. The reversal of 1312161020 is 201612131.

It is a self number, because there is not a number n which added to its sum of digits gives 1312161020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312161029) 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, 32804006 + ... + 32804045.

It is an arithmetic number, because the mean of its divisors is an integer number (229628182).

Almost surely, 2^1312161020 is an apocalyptic number.

1312161020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312161020 is an abundant number, since it is smaller than the sum of its proper divisors (1443377164).

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

1312161020 is a wasteful number, since it uses less digits than its factorization.

1312161020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65608060 (or 65608058 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1312161020 is about 36223.7631948974. The cubic root of 1312161020 is about 1094.7855184816.

Adding to 1312161020 its reverse (201612131), we get a palindrome (1513773151).

The spelling of 1312161020 in words is "one billion, three hundred twelve million, one hundred sixty-one thousand, twenty".