81022013 has 2 divisors, whose sum is σ = 81022014. Its totient is φ = 81022012.

The previous prime is 81021991. The next prime is 81022033. The reversal of 81022013 is 31022018.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65983129 + 15038884 = 8123^2 + 3878^2 .

It is a cyclic number.

It is not a de Polignac number, because 81022013 - 2¹² = 81017917 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 81021982 and 81022000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81022033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40511006 + 40511007.

It is an arithmetic number, because the mean of its divisors is an integer number (40511007).

Almost surely, 2^81022013 is an apocalyptic number.

It is an amenable number.

81022013 is a deficient number, since it is larger than the sum of its proper divisors (1).

81022013 is an equidigital number, since it uses as much as digits as its factorization.

81022013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 81022013 is about 9001.2228613672. Note that the first 3 decimals coincide. The cubic root of 81022013 is about 432.7140628999.

The spelling of 81022013 in words is "eighty-one million, twenty-two thousand, thirteen".