111629891 has 2 divisors, whose sum is σ = 111629892. Its totient is φ = 111629890.

The previous prime is 111629887. The next prime is 111629897. The reversal of 111629891 is 198926111.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 111629891 - 2² = 111629887 is a prime.

It is a super-2 number, since 2×111629891² = 24922465129343762, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (111629897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55814945 + 55814946.

It is an arithmetic number, because the mean of its divisors is an integer number (55814946).

Almost surely, 2^111629891 is an apocalyptic number.

111629891 is a deficient number, since it is larger than the sum of its proper divisors (1).

111629891 is an equidigital number, since it uses as much as digits as its factorization.

111629891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 38.

The square root of 111629891 is about 10565.5047678755. The cubic root of 111629891 is about 481.4969053831.

The spelling of 111629891 in words is "one hundred eleven million, six hundred twenty-nine thousand, eight hundred ninety-one".