111436861671491 has 2 divisors, whose sum is σ = 111436861671492. Its totient is φ = 111436861671490.

The previous prime is 111436861671383. The next prime is 111436861671493. The reversal of 111436861671491 is 194176168634111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111436861671491 - 2²⁶ = 111436794562627 is a prime.

Together with 111436861671493, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111436861671491.

It is not a weakly prime, because it can be changed into another prime (111436861671493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55718430835745 + 55718430835746.

It is an arithmetic number, because the mean of its divisors is an integer number (55718430835746).

Almost surely, 2^{111436861671491} is an apocalyptic number.

111436861671491 is a deficient number, since it is larger than the sum of its proper divisors (1).

111436861671491 is an equidigital number, since it uses as much as digits as its factorization.

111436861671491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5225472, while the sum is 59.

The spelling of 111436861671491 in words is "one hundred eleven trillion, four hundred thirty-six billion, eight hundred sixty-one million, six hundred seventy-one thousand, four hundred ninety-one".