69220981 has 2 divisors, whose sum is σ = 69220982. Its totient is φ = 69220980.

The previous prime is 69220937. The next prime is 69220993. The reversal of 69220981 is 18902296.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60310756 + 8910225 = 7766^2 + 2985^2 .

It is a cyclic number.

It is not a de Polignac number, because 69220981 - 2⁹ = 69220469 is a prime.

It is a super-2 number, since 2×69220981² = 9583088421204722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 69220981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69220381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34610490 + 34610491.

It is an arithmetic number, because the mean of its divisors is an integer number (34610491).

Almost surely, 2^69220981 is an apocalyptic number.

It is an amenable number.

69220981 is a deficient number, since it is larger than the sum of its proper divisors (1).

69220981 is an equidigital number, since it uses as much as digits as its factorization.

69220981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 69220981 is about 8319.9147231207. The cubic root of 69220981 is about 410.5939853728.

The spelling of 69220981 in words is "sixty-nine million, two hundred twenty thousand, nine hundred eighty-one".