1061220645 has 12 divisors (see below), whose sum is σ = 1839449196. Its totient is φ = 565984320.

The previous prime is 1061220593. The next prime is 1061220649. The reversal of 1061220645 is 5460221601.

1061220645 is a `hidden beast` number, since 1 + 0 + 6 + 12 + 2 + 0 + 645 = 666.

1061220645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 211964481 + 849256164 = 14559^2 + 29142^2 .

It is not a de Polignac number, because 1061220645 - 2⁶ = 1061220581 is a prime.

It is a super-2 number, since 2×1061220645² = 2252378514748432050, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1061220649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11791296 + ... + 11791385.

It is an arithmetic number, because the mean of its divisors is an integer number (153287433).

Almost surely, 2^1061220645 is an apocalyptic number.

1061220645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1061220645 is a deficient number, since it is larger than the sum of its proper divisors (778228551).

1061220645 is a wasteful number, since it uses less digits than its factorization.

1061220645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23582692 (or 23582689 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 1061220645 is about 32576.3817051557. The cubic root of 1061220645 is about 1020.0040513103.

The spelling of 1061220645 in words is "one billion, sixty-one million, two hundred twenty thousand, six hundred forty-five".