81117119 has 2 divisors, whose sum is σ = 81117120. Its totient is φ = 81117118.

The previous prime is 81117097. The next prime is 81117131. The reversal of 81117119 is 91171118.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81117119 is a prime.

It is a super-2 number, since 2×81117119² = 13159973989720322, 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 = 81117091 and 81117100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81117199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40558559 + 40558560.

It is an arithmetic number, because the mean of its divisors is an integer number (40558560).

Almost surely, 2^81117119 is an apocalyptic number.

81117119 is a deficient number, since it is larger than the sum of its proper divisors (1).

81117119 is an equidigital number, since it uses as much as digits as its factorization.

81117119 is an evil number, because the sum of its binary digits is even.

The product of its digits is 504, while the sum is 29.

The square root of 81117119 is about 9006.5042608106. The cubic root of 81117119 is about 432.8833074881.

The spelling of 81117119 in words is "eighty-one million, one hundred seventeen thousand, one hundred nineteen".