111720971 has 2 divisors, whose sum is σ = 111720972. Its totient is φ = 111720970.

The previous prime is 111720949. The next prime is 111720977. The reversal of 111720971 is 179027111.

It is a strong prime.

It is an emirp because it is prime and its reverse (179027111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111720971 - 2¹⁸ = 111458827 is a prime.

It is a super-2 number, since 2×111720971² = 24963150722365682, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (111720977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55860485 + 55860486.

It is an arithmetic number, because the mean of its divisors is an integer number (55860486).

Almost surely, 2^111720971 is an apocalyptic number.

111720971 is a deficient number, since it is larger than the sum of its proper divisors (1).

111720971 is an equidigital number, since it uses as much as digits as its factorization.

111720971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 882, while the sum is 29.

The square root of 111720971 is about 10569.8141421692. The cubic root of 111720971 is about 481.6278225773.

The spelling of 111720971 in words is "one hundred eleven million, seven hundred twenty thousand, nine hundred seventy-one".