111136981 has 2 divisors, whose sum is σ = 111136982. Its totient is φ = 111136980.

The previous prime is 111136967. The next prime is 111137009. The reversal of 111136981 is 189631111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102697956 + 8439025 = 10134^2 + 2905^2 .

It is a cyclic number.

It is not a de Polignac number, because 111136981 - 2¹³ = 111128789 is a prime.

It is a super-2 number, since 2×111136981² = 24702857091588722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111136901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55568490 + 55568491.

It is an arithmetic number, because the mean of its divisors is an integer number (55568491).

Almost surely, 2^111136981 is an apocalyptic number.

It is an amenable number.

111136981 is a deficient number, since it is larger than the sum of its proper divisors (1).

111136981 is an equidigital number, since it uses as much as digits as its factorization.

111136981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 31.

The square root of 111136981 is about 10542.1525790514. The cubic root of 111136981 is about 480.7871647100.

The spelling of 111136981 in words is "one hundred eleven million, one hundred thirty-six thousand, nine hundred eighty-one".