1061099681 has 4 divisors (see below), whose sum is σ = 1061511492. Its totient is φ = 1060687872.

The previous prime is 1061099657. The next prime is 1061099701. The reversal of 1061099681 is 1869901601.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1869901601 = 9697 ⋅192833.

It can be written as a sum of positive squares in 2 ways, for example, as 249134656 + 811965025 = 15784^2 + 28495^2 .

It is a cyclic number.

It is not a de Polignac number, because 1061099681 - 2¹⁴ = 1061083297 is a prime.

It is a super-2 number, since 2×1061099681² = 2251865066036603522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1061099621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202016 + ... + 207201.

It is an arithmetic number, because the mean of its divisors is an integer number (265377873).

Almost surely, 2^1061099681 is an apocalyptic number.

It is an amenable number.

1061099681 is a deficient number, since it is larger than the sum of its proper divisors (411811).

1061099681 is an equidigital number, since it uses as much as digits as its factorization.

1061099681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411810.

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 1061099681 is about 32574.5250310730. The cubic root of 1061099681 is about 1019.9652945388.

The spelling of 1061099681 in words is "one billion, sixty-one million, ninety-nine thousand, six hundred eighty-one".