1311251405344 has 12 divisors (see below), whose sum is σ = 2581526204334. Its totient is φ = 655625702656.

The previous prime is 1311251405333. The next prime is 1311251405351. The reversal of 1311251405344 is 4435041521131.

It can be written as a sum of positive squares in only one way, i.e., 820147584400 + 491103820944 = 905620^2 + 700788^2 .

It is a super-2 number, since 2×1311251405344² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20488303177 + ... + 20488303240.

Almost surely, 2^{1311251405344} is an apocalyptic number.

It is an amenable number.

1311251405344 is a deficient number, since it is larger than the sum of its proper divisors (1270274798990).

1311251405344 is an equidigital number, since it uses as much as digits as its factorization.

1311251405344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40976606427 (or 40976606419 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

Adding to 1311251405344 its reverse (4435041521131), we get a palindrome (5746292926475).

The spelling of 1311251405344 in words is "one trillion, three hundred eleven billion, two hundred fifty-one million, four hundred five thousand, three hundred forty-four".