81028741 has 2 divisors, whose sum is σ = 81028742. Its totient is φ = 81028740.

The previous prime is 81028721. The next prime is 81028757. The reversal of 81028741 is 14782018.

81028741 is nontrivially palindromic in base 6.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76055841 + 4972900 = 8721^2 + 2230^2 .

It is a cyclic number.

It is not a de Polignac number, because 81028741 - 2⁵ = 81028709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81028721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40514370 + 40514371.

It is an arithmetic number, because the mean of its divisors is an integer number (40514371).

Almost surely, 2^81028741 is an apocalyptic number.

It is an amenable number.

81028741 is a deficient number, since it is larger than the sum of its proper divisors (1).

81028741 is an equidigital number, since it uses as much as digits as its factorization.

81028741 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 81028741 is about 9001.5965806072. The cubic root of 81028741 is about 432.7260399726.

The spelling of 81028741 in words is "eighty-one million, twenty-eight thousand, seven hundred forty-one".