1115315431381 has 2 divisors, whose sum is σ = 1115315431382. Its totient is φ = 1115315431380.

The previous prime is 1115315431333. The next prime is 1115315431397. The reversal of 1115315431381 is 1831345135111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1044044586225 + 71270845156 = 1021785^2 + 266966^2 .

It is a cyclic number.

It is not a de Polignac number, because 1115315431381 - 2²⁵ = 1115281876949 is a prime.

It is a super-2 number, since 2×1115315431381² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1115315431381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1115315431331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 557657715690 + 557657715691.

It is an arithmetic number, because the mean of its divisors is an integer number (557657715691).

Almost surely, 2^{1115315431381} is an apocalyptic number.

It is an amenable number.

1115315431381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1115315431381 is an equidigital number, since it uses as much as digits as its factorization.

1115315431381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 37.

The spelling of 1115315431381 in words is "one trillion, one hundred fifteen billion, three hundred fifteen million, four hundred thirty-one thousand, three hundred eighty-one".