81226741 has 2 divisors, whose sum is σ = 81226742. Its totient is φ = 81226740.

The previous prime is 81226693. The next prime is 81226751. The reversal of 81226741 is 14762218.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51480625 + 29746116 = 7175^2 + 5454^2 .

It is a cyclic number.

It is not a de Polignac number, because 81226741 - 2¹⁷ = 81095669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81226751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40613370 + 40613371.

It is an arithmetic number, because the mean of its divisors is an integer number (40613371).

Almost surely, 2^81226741 is an apocalyptic number.

It is an amenable number.

81226741 is a deficient number, since it is larger than the sum of its proper divisors (1).

81226741 is an equidigital number, since it uses as much as digits as its factorization.

81226741 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5376, while the sum is 31.

The square root of 81226741 is about 9012.5879191273. The cubic root of 81226741 is about 433.0782197921.

Adding to 81226741 its reverse (14762218), we get a palindrome (95988959).

The spelling of 81226741 in words is "eighty-one million, two hundred twenty-six thousand, seven hundred forty-one".