1311252115402 has 4 divisors (see below), whose sum is σ = 1966878173106. Its totient is φ = 655626057700.

The previous prime is 1311252115361. The next prime is 1311252115421. The reversal of 1311252115402 is 2045112521131.

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., 804323779281 + 506928336121 = 896841^2 + 711989^2 .

It is a super-2 number, since 2×1311252115402² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327813028849 + ... + 327813028852.

Almost surely, 2^{1311252115402} is an apocalyptic number.

1311252115402 is a deficient number, since it is larger than the sum of its proper divisors (655626057704).

1311252115402 is an equidigital number, since it uses as much as digits as its factorization.

1311252115402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655626057703.

The product of its (nonzero) digits is 2400, while the sum is 28.

Adding to 1311252115402 its reverse (2045112521131), we get a palindrome (3356364636533).

The spelling of 1311252115402 in words is "one trillion, three hundred eleven billion, two hundred fifty-two million, one hundred fifteen thousand, four hundred two".