81107801 has 2 divisors, whose sum is σ = 81107802. Its totient is φ = 81107800.

The previous prime is 81107797. The next prime is 81107837. The reversal of 81107801 is 10870118.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70224400 + 10883401 = 8380^2 + 3299^2 .

It is a cyclic number.

It is not a de Polignac number, because 81107801 - 2² = 81107797 is a prime.

It is equal to p_4730435 and since 81107801 and 4730435 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (81107701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40553900 + 40553901.

It is an arithmetic number, because the mean of its divisors is an integer number (40553901).

Almost surely, 2^81107801 is an apocalyptic number.

It is an amenable number.

81107801 is a deficient number, since it is larger than the sum of its proper divisors (1).

81107801 is an equidigital number, since it uses as much as digits as its factorization.

81107801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 26.

The square root of 81107801 is about 9005.9869531329. The cubic root of 81107801 is about 432.8667316154.

Adding to 81107801 its reverse (10870118), we get a palindrome (91977919).

The spelling of 81107801 in words is "eighty-one million, one hundred seven thousand, eight hundred one".