111661469 has 2 divisors, whose sum is σ = 111661470. Its totient is φ = 111661468.

The previous prime is 111661441. The next prime is 111661471. The reversal of 111661469 is 964166111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111555844 + 105625 = 10562^2 + 325^2 .

It is an emirp because it is prime and its reverse (964166111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111661469 - 2⁸ = 111661213 is a prime.

It is a super-2 number, since 2×111661469² = 24936567318475922, which contains 22 as substring.

Together with 111661471, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111661369) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55830734 + 55830735.

It is an arithmetic number, because the mean of its divisors is an integer number (55830735).

Almost surely, 2^111661469 is an apocalyptic number.

It is an amenable number.

111661469 is a deficient number, since it is larger than the sum of its proper divisors (1).

111661469 is an equidigital number, since it uses as much as digits as its factorization.

111661469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 35.

The square root of 111661469 is about 10566.9990536576. Note that the first 3 decimals coincide. The cubic root of 111661469 is about 481.5423032470.

The spelling of 111661469 in words is "one hundred eleven million, six hundred sixty-one thousand, four hundred sixty-nine".