1312020100 has 18 divisors (see below), whose sum is σ = 2847083834. Its totient is φ = 524808000.

The previous prime is 1312020097. The next prime is 1312020103. The reversal of 1312020100 is 10202131.

It is an interprime number because it is at equal distance from previous prime (1312020097) and next prime (1312020103).

It can be written as a sum of positive squares in 3 ways, for example, as 81974916 + 1230045184 = 9054^2 + 35072^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (1312020103) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6560001 + ... + 6560200.

Almost surely, 2^1312020100 is an apocalyptic number.

1312020100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312020100 is an abundant number, since it is smaller than the sum of its proper divisors (1535063734).

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

1312020100 is a wasteful number, since it uses less digits than its factorization.

1312020100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13120215 (or 13120208 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1312020100 is about 36221.8180106963. The cubic root of 1312020100 is about 1094.7463254517.

Adding to 1312020100 its reverse (10202131), we get a palindrome (1322222231).

The spelling of 1312020100 in words is "one billion, three hundred twelve million, twenty thousand, one hundred".