81342119 has 2 divisors, whose sum is σ = 81342120. Its totient is φ = 81342118.

The previous prime is 81342091. The next prime is 81342133. The reversal of 81342119 is 91124318.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81342119 - 2⁸ = 81341863 is a prime.

It is a super-2 number, since 2×81342119² = 13233080646820322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 81342091 and 81342100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81342139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40671059 + 40671060.

It is an arithmetic number, because the mean of its divisors is an integer number (40671060).

Almost surely, 2^81342119 is an apocalyptic number.

81342119 is a deficient number, since it is larger than the sum of its proper divisors (1).

81342119 is an equidigital number, since it uses as much as digits as its factorization.

81342119 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 29.

The square root of 81342119 is about 9018.9865838685. The cubic root of 81342119 is about 433.2831771666.

The spelling of 81342119 in words is "eighty-one million, three hundred forty-two thousand, one hundred nineteen".