1312121012 has 6 divisors (see below), whose sum is σ = 2296211778. Its totient is φ = 656060504.

The previous prime is 1312121009. The next prime is 1312121051. The reversal of 1312121012 is 2101212131.

It can be written as a sum of positive squares in only one way, i.e., 1239462436 + 72658576 = 35206^2 + 8524^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164015123 + ... + 164015130.

It is an arithmetic number, because the mean of its divisors is an integer number (382701963).

Almost surely, 2^1312121012 is an apocalyptic number.

It is an amenable number.

1312121012 is a deficient number, since it is larger than the sum of its proper divisors (984090766).

1312121012 is a wasteful number, since it uses less digits than its factorization.

1312121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328030257 (or 328030255 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 1312121012 is about 36223.2109565124. The cubic root of 1312121012 is about 1094.7743916398.

Adding to 1312121012 its reverse (2101212131), we get a palindrome (3413333143).

The spelling of 1312121012 in words is "one billion, three hundred twelve million, one hundred twenty-one thousand, twelve".