1061055561 has 8 divisors (see below), whose sum is σ = 1497960864. Its totient is φ = 665760320.

The previous prime is 1061055553. The next prime is 1061055571. The reversal of 1061055561 is 1655501601.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1061055561 - 2³ = 1061055553 is a prime.

It is a super-2 number, since 2×1061055561² = 2251677807058049442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1061055571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10402455 + ... + 10402556.

It is an arithmetic number, because the mean of its divisors is an integer number (187245108).

Almost surely, 2^1061055561 is an apocalyptic number.

It is an amenable number.

1061055561 is a deficient number, since it is larger than the sum of its proper divisors (436905303).

1061055561 is a wasteful number, since it uses less digits than its factorization.

1061055561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20805031.

The product of its (nonzero) digits is 4500, while the sum is 30.

The square root of 1061055561 is about 32573.8478077122. The cubic root of 1061055561 is about 1019.9511577920.

The spelling of 1061055561 in words is "one billion, sixty-one million, fifty-five thousand, five hundred sixty-one".