111952171 has 2 divisors, whose sum is σ = 111952172. Its totient is φ = 111952170.

The previous prime is 111952117. The next prime is 111952187. The reversal of 111952171 is 171259111.

Together with previous prime (111952117) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (171259111) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111952171 is a prime.

It is a super-2 number, since 2×111952171² = 25066577183226482, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (111955171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55976085 + 55976086.

It is an arithmetic number, because the mean of its divisors is an integer number (55976086).

Almost surely, 2^111952171 is an apocalyptic number.

111952171 is a deficient number, since it is larger than the sum of its proper divisors (1).

111952171 is an equidigital number, since it uses as much as digits as its factorization.

111952171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 630, while the sum is 28.

The square root of 111952171 is about 10580.7452951104. The cubic root of 111952171 is about 481.9598271759.

It can be divided in two parts, 11195 and 2171, that added together give a triangular number (13366 = T₁₆₃).

The spelling of 111952171 in words is "one hundred eleven million, nine hundred fifty-two thousand, one hundred seventy-one".