81103619 has 2 divisors, whose sum is σ = 81103620. Its totient is φ = 81103618.

The previous prime is 81103601. The next prime is 81103721. The reversal of 81103619 is 91630118.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81103619 is a prime.

It is a super-2 number, since 2×81103619² = 13155594029794322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81103591 and 81103600.

It is not a weakly prime, because it can be changed into another prime (83103619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40551809 + 40551810.

It is an arithmetic number, because the mean of its divisors is an integer number (40551810).

Almost surely, 2^81103619 is an apocalyptic number.

81103619 is a deficient number, since it is larger than the sum of its proper divisors (1).

81103619 is an equidigital number, since it uses as much as digits as its factorization.

81103619 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 81103619 is about 9005.7547712560. The cubic root of 81103619 is about 432.8592918058.

The spelling of 81103619 in words is "eighty-one million, one hundred three thousand, six hundred nineteen".