81022057 has 2 divisors, whose sum is σ = 81022058. Its totient is φ = 81022056.

The previous prime is 81022037. The next prime is 81022079. The reversal of 81022057 is 75022018.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62394201 + 18627856 = 7899^2 + 4316^2 .

It is a cyclic number.

It is not a de Polignac number, because 81022057 - 2⁷ = 81021929 is a prime.

It is a super-2 number, since 2×81022057² = 13129147441022498, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81022037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40511028 + 40511029.

It is an arithmetic number, because the mean of its divisors is an integer number (40511029).

Almost surely, 2^81022057 is an apocalyptic number.

It is an amenable number.

81022057 is a deficient number, since it is larger than the sum of its proper divisors (1).

81022057 is an equidigital number, since it uses as much as digits as its factorization.

81022057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 81022057 is about 9001.2253054792. The cubic root of 81022057 is about 432.7141412301.

The spelling of 81022057 in words is "eighty-one million, twenty-two thousand, fifty-seven".