81112429 has 2 divisors, whose sum is σ = 81112430. Its totient is φ = 81112428.

The previous prime is 81112403. The next prime is 81112439. The reversal of 81112429 is 92421118.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77968900 + 3143529 = 8830^2 + 1773^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81112429 is a prime.

It is a super-2 number, since 2×81112429² = 13158452276560082, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 81112397 and 81112406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81112439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40556214 + 40556215.

It is an arithmetic number, because the mean of its divisors is an integer number (40556215).

Almost surely, 2^81112429 is an apocalyptic number.

It is an amenable number.

81112429 is a deficient number, since it is larger than the sum of its proper divisors (1).

81112429 is an equidigital number, since it uses as much as digits as its factorization.

81112429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 28.

The square root of 81112429 is about 9006.2438896579. The cubic root of 81112429 is about 432.8749645643.

The spelling of 81112429 in words is "eighty-one million, one hundred twelve thousand, four hundred twenty-nine".