81107419 has 2 divisors, whose sum is σ = 81107420. Its totient is φ = 81107418.

The previous prime is 81107413. The next prime is 81107513. The reversal of 81107419 is 91470118.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81107419 - 2⁷ = 81107291 is a prime.

It is a super-2 number, since 2×81107419² = 13156826833683122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81107413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40553709 + 40553710.

It is an arithmetic number, because the mean of its divisors is an integer number (40553710).

Almost surely, 2^81107419 is an apocalyptic number.

81107419 is a deficient number, since it is larger than the sum of its proper divisors (1).

81107419 is an equidigital number, since it uses as much as digits as its factorization.

81107419 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 31.

The square root of 81107419 is about 9005.9657449937. The cubic root of 81107419 is about 432.8660520451.

The spelling of 81107419 in words is "eighty-one million, one hundred seven thousand, four hundred nineteen".