1312501402 has 4 divisors (see below), whose sum is σ = 1968752106. Its totient is φ = 656250700.

The previous prime is 1312501387. The next prime is 1312501447. The reversal of 1312501402 is 2041052131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1189491121 + 123010281 = 34489^2 + 11091^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1312501402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328125349 + ... + 328125352.

Almost surely, 2^1312501402 is an apocalyptic number.

1312501402 is a deficient number, since it is larger than the sum of its proper divisors (656250704).

1312501402 is an equidigital number, since it uses as much as digits as its factorization.

1312501402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656250703.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 1312501402 is about 36228.4612149067. The cubic root of 1312501402 is about 1094.8801748186.

Adding to 1312501402 its reverse (2041052131), we get a palindrome (3353553533).

The spelling of 1312501402 in words is "one billion, three hundred twelve million, five hundred one thousand, four hundred two".