111129881 has 2 divisors, whose sum is σ = 111129882. Its totient is φ = 111129880.

The previous prime is 111129869. The next prime is 111129899. The reversal of 111129881 is 188921111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59059225 + 52070656 = 7685^2 + 7216^2 .

It is a cyclic number.

It is not a de Polignac number, because 111129881 - 2²⁶ = 44021017 is a prime.

It is a super-2 number, since 2×111129881² = 24699700902148322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (111129581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55564940 + 55564941.

It is an arithmetic number, because the mean of its divisors is an integer number (55564941).

Almost surely, 2^111129881 is an apocalyptic number.

It is an amenable number.

111129881 is a deficient number, since it is larger than the sum of its proper divisors (1).

111129881 is an equidigital number, since it uses as much as digits as its factorization.

111129881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 32.

The square root of 111129881 is about 10541.8158303017. The cubic root of 111129881 is about 480.7769261091.

The spelling of 111129881 in words is "one hundred eleven million, one hundred twenty-nine thousand, eight hundred eighty-one".