1055981009 has 2 divisors, whose sum is σ = 1055981010. Its totient is φ = 1055981008.

The previous prime is 1055980951. The next prime is 1055981023. The reversal of 1055981009 is 9001895501.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 970011025 + 85969984 = 31145^2 + 9272^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1055981009 is a prime.

It is a super-2 number, since 2×1055981009² = 2230191782737316162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1055981909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 527990504 + 527990505.

It is an arithmetic number, because the mean of its divisors is an integer number (527990505).

Almost surely, 2^1055981009 is an apocalyptic number.

It is an amenable number.

1055981009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1055981009 is an equidigital number, since it uses as much as digits as its factorization.

1055981009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 38.

The square root of 1055981009 is about 32495.8614134169. The cubic root of 1055981009 is about 1018.3225693878.

The spelling of 1055981009 in words is "one billion, fifty-five million, nine hundred eighty-one thousand, nine".