111443661631 has 2 divisors, whose sum is σ = 111443661632. Its totient is φ = 111443661630.

The previous prime is 111443661629. The next prime is 111443661647. The reversal of 111443661631 is 136166344111.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 111443661631 - 2¹ = 111443661629 is a prime.

It is a super-2 number, since 2×111443661631² (a number of 23 digits) contains 22 as substring.

Together with 111443661629, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111443661601) by changing a digit.

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, 55721830815 + 55721830816.

It is an arithmetic number, because the mean of its divisors is an integer number (55721830816).

Almost surely, 2^111443661631 is an apocalyptic number.

111443661631 is a deficient number, since it is larger than the sum of its proper divisors (1).

111443661631 is an equidigital number, since it uses as much as digits as its factorization.

111443661631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 37.

The spelling of 111443661631 in words is "one hundred eleven billion, four hundred forty-three million, six hundred sixty-one thousand, six hundred thirty-one".