1312165408 has 12 divisors (see below), whose sum is σ = 2583325710. Its totient is φ = 656082688.

The previous prime is 1312165399. The next prime is 1312165409. The reversal of 1312165408 is 8045612131.

It can be written as a sum of positive squares in only one way, i.e., 1277919504 + 34245904 = 35748^2 + 5852^2 .

It is a super-3 number, since 3×1312165408³ (a number of 28 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1312165408.

It is not an unprimeable number, because it can be changed into a prime (1312165409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20502553 + ... + 20502616.

Almost surely, 2^1312165408 is an apocalyptic number.

It is an amenable number.

1312165408 is a deficient number, since it is larger than the sum of its proper divisors (1271160302).

1312165408 is an equidigital number, since it uses as much as digits as its factorization.

1312165408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41005179 (or 41005171 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 1312165408 is about 36223.8237628222. The cubic root of 1312165408 is about 1094.7867388383.

Adding to 1312165408 its reverse (8045612131), we get a palindrome (9357777539).

The spelling of 1312165408 in words is "one billion, three hundred twelve million, one hundred sixty-five thousand, four hundred eight".