10985981 has 2 divisors, whose sum is σ = 10985982. Its totient is φ = 10985980.

The previous prime is 10985959. The next prime is 10985993. The reversal of 10985981 is 18958901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10666756 + 319225 = 3266^2 + 565^2 .

It is a cyclic number.

It is not a de Polignac number, because 10985981 - 2²² = 6791677 is a prime.

It is a super-2 number, since 2×10985981² = 241383557064722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10985911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5492990 + 5492991.

It is an arithmetic number, because the mean of its divisors is an integer number (5492991).

Almost surely, 2^10985981 is an apocalyptic number.

It is an amenable number.

10985981 is a deficient number, since it is larger than the sum of its proper divisors (1).

10985981 is an equidigital number, since it uses as much as digits as its factorization.

10985981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 41.

The square root of 10985981 is about 3314.5106727841. The cubic root of 10985981 is about 222.3034901744.

The spelling of 10985981 in words is "ten million, nine hundred eighty-five thousand, nine hundred eighty-one".