1312001816 has 8 divisors (see below), whose sum is σ = 2460003420. Its totient is φ = 656000904.

The previous prime is 1312001791. The next prime is 1312001837. The reversal of 1312001816 is 6181002131.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 1312001791 and 1312001800.

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, 82000106 + ... + 82000121.

Almost surely, 2^1312001816 is an apocalyptic number.

It is an amenable number.

1312001816 is a deficient number, since it is larger than the sum of its proper divisors (1148001604).

1312001816 is a wasteful number, since it uses less digits than its factorization.

1312001816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164000233 (or 164000229 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 1312001816 is about 36221.5656204974. The cubic root of 1312001816 is about 1094.7412400532.

Adding to 1312001816 its reverse (6181002131), we get a palindrome (7493003947).

The spelling of 1312001816 in words is "one billion, three hundred twelve million, one thousand, eight hundred sixteen".