111920969 has 2 divisors, whose sum is σ = 111920970. Its totient is φ = 111920968.

The previous prime is 111920953. The next prime is 111920989. The reversal of 111920969 is 969029111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94322944 + 17598025 = 9712^2 + 4195^2 .

It is an emirp because it is prime and its reverse (969029111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111920969 - 2⁴ = 111920953 is a prime.

It is a super-2 number, since 2×111920969² = 25052606603797922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (111920989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55960484 + 55960485.

It is an arithmetic number, because the mean of its divisors is an integer number (55960485).

Almost surely, 2^111920969 is an apocalyptic number.

It is an amenable number.

111920969 is a deficient number, since it is larger than the sum of its proper divisors (1).

111920969 is an equidigital number, since it uses as much as digits as its factorization.

111920969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 38.

The square root of 111920969 is about 10579.2707215573. The cubic root of 111920969 is about 481.9150476131.

The spelling of 111920969 in words is "one hundred eleven million, nine hundred twenty thousand, nine hundred sixty-nine".