81101417 has 2 divisors, whose sum is σ = 81101418. Its totient is φ = 81101416.

The previous prime is 81101413. The next prime is 81101453. The reversal of 81101417 is 71410118.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52113961 + 28987456 = 7219^2 + 5384^2 .

It is a cyclic number.

It is not a de Polignac number, because 81101417 - 2² = 81101413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81101392 and 81101401.

It is not a weakly prime, because it can be changed into another prime (81101411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40550708 + 40550709.

It is an arithmetic number, because the mean of its divisors is an integer number (40550709).

Almost surely, 2^81101417 is an apocalyptic number.

It is an amenable number.

81101417 is a deficient number, since it is larger than the sum of its proper divisors (1).

81101417 is an equidigital number, since it uses as much as digits as its factorization.

81101417 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 23.

The square root of 81101417 is about 9005.6325152651. The cubic root of 81101417 is about 432.8553743284.

It can be divided in two parts, 81101 and 417, that added together give a palindrome (81518).

The spelling of 81101417 in words is "eighty-one million, one hundred one thousand, four hundred seventeen".