1061641309 has 4 divisors (see below), whose sum is σ = 1098249660. Its totient is φ = 1025032960.

The previous prime is 1061641307. The next prime is 1061641351. The reversal of 1061641309 is 9031461601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9031461601 = 31 ⋅291337471.

It can be written as a sum of positive squares in 2 ways, for example, as 591705625 + 469935684 = 24325^2 + 21678^2 .

It is a cyclic number.

It is not a de Polignac number, because 1061641309 - 2¹ = 1061641307 is a prime.

It is a super-2 number, since 2×1061641309² = 2254164537950466962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1061641307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18304132 + ... + 18304189.

It is an arithmetic number, because the mean of its divisors is an integer number (274562415).

Almost surely, 2^1061641309 is an apocalyptic number.

It is an amenable number.

1061641309 is a deficient number, since it is larger than the sum of its proper divisors (36608351).

1061641309 is an equidigital number, since it uses as much as digits as its factorization.

1061641309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36608350.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 1061641309 is about 32582.8376449934. The cubic root of 1061641309 is about 1020.1388088035.

The spelling of 1061641309 in words is "one billion, sixty-one million, six hundred forty-one thousand, three hundred nine".