81114637 has 2 divisors, whose sum is σ = 81114638. Its totient is φ = 81114636.

The previous prime is 81114617. The next prime is 81114647. The reversal of 81114637 is 73641118.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68906601 + 12208036 = 8301^2 + 3494^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81114637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81114599 and 81114608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81114617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40557318 + 40557319.

It is an arithmetic number, because the mean of its divisors is an integer number (40557319).

Almost surely, 2^81114637 is an apocalyptic number.

It is an amenable number.

81114637 is a deficient number, since it is larger than the sum of its proper divisors (1).

81114637 is an equidigital number, since it uses as much as digits as its factorization.

81114637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 31.

The square root of 81114637 is about 9006.3664704474. The cubic root of 81114637 is about 432.8788923604.

The spelling of 81114637 in words is "eighty-one million, one hundred fourteen thousand, six hundred thirty-seven".