111602081 has 2 divisors, whose sum is σ = 111602082. Its totient is φ = 111602080.

The previous prime is 111602011. The next prime is 111602083. The reversal of 111602081 is 180206111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73273600 + 38328481 = 8560^2 + 6191^2 .

It is a cyclic number.

It is not a de Polignac number, because 111602081 - 2¹⁸ = 111339937 is a prime.

It is a super-2 number, since 2×111602081² = 24910048967061122, which contains 22 as substring.

Together with 111602083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (111602083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55801040 + 55801041.

It is an arithmetic number, because the mean of its divisors is an integer number (55801041).

Almost surely, 2^111602081 is an apocalyptic number.

It is an amenable number.

111602081 is a deficient number, since it is larger than the sum of its proper divisors (1).

111602081 is an equidigital number, since it uses as much as digits as its factorization.

111602081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 20.

The square root of 111602081 is about 10564.1886105843. The cubic root of 111602081 is about 481.4569174643.

Adding to 111602081 its reverse (180206111), we get a palindrome (291808192).

The spelling of 111602081 in words is "one hundred eleven million, six hundred two thousand, eighty-one".