10220981 has 2 divisors, whose sum is σ = 10220982. Its totient is φ = 10220980.

The previous prime is 10220939. The next prime is 10221007. The reversal of 10220981 is 18902201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7102225 + 3118756 = 2665^2 + 1766^2 .

It is an emirp because it is prime and its reverse (18902201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10220981 - 2²² = 6026677 is a prime.

It is a super-2 number, since 2×10220981² = 208936905204722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10220911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5110490 + 5110491.

It is an arithmetic number, because the mean of its divisors is an integer number (5110491).

Almost surely, 2^10220981 is an apocalyptic number.

It is an amenable number.

10220981 is a deficient number, since it is larger than the sum of its proper divisors (1).

10220981 is an equidigital number, since it uses as much as digits as its factorization.

10220981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 10220981 is about 3197.0269001058. The cubic root of 10220981 is about 217.0188845791.

The spelling of 10220981 in words is "ten million, two hundred twenty thousand, nine hundred eighty-one".