1311513215445 has 32 divisors (see below), whose sum is σ = 2432952057600. Its totient is φ = 669061812672.

The previous prime is 1311513215443. The next prime is 1311513215447. The reversal of 1311513215445 is 5445123151131.

1311513215445 is a `hidden beast` number, since 1 + 31 + 1 + 51 + 32 + 1 + 544 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (1311513215443) and next prime (1311513215447).

It is not a de Polignac number, because 1311513215445 - 2¹ = 1311513215443 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311513215443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 211190650 + ... + 211196859.

It is an arithmetic number, because the mean of its divisors is an integer number (76029751800).

Almost surely, 2^{1311513215445} is an apocalyptic number.

1311513215445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1311513215445 is a deficient number, since it is larger than the sum of its proper divisors (1121438842155).

1311513215445 is a wasteful number, since it uses less digits than its factorization.

1311513215445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422387546 (or 422387540 counting only the distinct ones).

The product of its digits is 36000, while the sum is 36.

Adding to 1311513215445 its reverse (5445123151131), we get a palindrome (6756636366576).

The spelling of 1311513215445 in words is "one trillion, three hundred eleven billion, five hundred thirteen million, two hundred fifteen thousand, four hundred forty-five".