111581023 has 2 divisors, whose sum is σ = 111581024. Its totient is φ = 111581022.

The previous prime is 111581003. The next prime is 111581039. The reversal of 111581023 is 320185111.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111581023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111580985 and 111581003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111581003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55790511 + 55790512.

It is an arithmetic number, because the mean of its divisors is an integer number (55790512).

Almost surely, 2^111581023 is an apocalyptic number.

111581023 is a deficient number, since it is larger than the sum of its proper divisors (1).

111581023 is an equidigital number, since it uses as much as digits as its factorization.

111581023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 111581023 is about 10563.1918944986. The cubic root of 111581023 is about 481.4266338070.

The spelling of 111581023 in words is "one hundred eleven million, five hundred eighty-one thousand, twenty-three".