111722257 has 2 divisors, whose sum is σ = 111722258. Its totient is φ = 111722256.

The previous prime is 111722173. The next prime is 111722287. The reversal of 111722257 is 752227111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111703761 + 18496 = 10569^2 + 136^2 .

It is an emirp because it is prime and its reverse (752227111) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111722257 is a prime.

It is not a weakly prime, because it can be changed into another prime (111722287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55861128 + 55861129.

It is an arithmetic number, because the mean of its divisors is an integer number (55861129).

Almost surely, 2^111722257 is an apocalyptic number.

It is an amenable number.

111722257 is a deficient number, since it is larger than the sum of its proper divisors (1).

111722257 is an equidigital number, since it uses as much as digits as its factorization.

111722257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1960, while the sum is 28.

The square root of 111722257 is about 10569.8749756087. The cubic root of 111722257 is about 481.6296705473.

Adding to 111722257 its reverse (752227111), we get a palindrome (863949368).

The spelling of 111722257 in words is "one hundred eleven million, seven hundred twenty-two thousand, two hundred fifty-seven".