111129989 has 2 divisors, whose sum is σ = 111129990. Its totient is φ = 111129988.

The previous prime is 111129959. The next prime is 111130013. The reversal of 111129989 is 989921111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77141089 + 33988900 = 8783^2 + 5830^2 .

It is a cyclic number.

It is not a de Polignac number, because 111129989 - 2¹⁶ = 111064453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111129929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55564994 + 55564995.

It is an arithmetic number, because the mean of its divisors is an integer number (55564995).

Almost surely, 2^111129989 is an apocalyptic number.

It is an amenable number.

111129989 is a deficient number, since it is larger than the sum of its proper divisors (1).

111129989 is an equidigital number, since it uses as much as digits as its factorization.

111129989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 41.

The square root of 111129989 is about 10541.8209527576. The cubic root of 111129989 is about 480.7770818545. Note that the first 3 decimals are identical.

The spelling of 111129989 in words is "one hundred eleven million, one hundred twenty-nine thousand, nine hundred eighty-nine".