1055720681 has 2 divisors, whose sum is σ = 1055720682. Its totient is φ = 1055720680.

The previous prime is 1055720629. The next prime is 1055720737. The reversal of 1055720681 is 1860275501.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 586608400 + 469112281 = 24220^2 + 21659^2 .

It is a cyclic number.

It is not a de Polignac number, because 1055720681 - 2²⁶ = 988611817 is a prime.

It is a super-2 number, since 2×1055720681² = 2229092312582207522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1055920681) 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 as a sum of consecutive naturals, namely, 527860340 + 527860341.

It is an arithmetic number, because the mean of its divisors is an integer number (527860341).

Almost surely, 2^1055720681 is an apocalyptic number.

It is an amenable number.

1055720681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1055720681 is an equidigital number, since it uses as much as digits as its factorization.

1055720681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16800, while the sum is 35.

The square root of 1055720681 is about 32491.8556102910. The cubic root of 1055720681 is about 1018.2388811197.

The spelling of 1055720681 in words is "one billion, fifty-five million, seven hundred twenty thousand, six hundred eighty-one".