1013775661 has 2 divisors, whose sum is σ = 1013775662. Its totient is φ = 1013775660.

The previous prime is 1013775643. The next prime is 1013775689. The reversal of 1013775661 is 1665773101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 624700036 + 389075625 = 24994^2 + 19725^2 .

It is a cyclic number.

It is not a de Polignac number, because 1013775661 - 2¹¹ = 1013773613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1013775661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1013775641) 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 as a sum of consecutive naturals, namely, 506887830 + 506887831.

It is an arithmetic number, because the mean of its divisors is an integer number (506887831).

Almost surely, 2^1013775661 is an apocalyptic number.

It is an amenable number.

1013775661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1013775661 is an equidigital number, since it uses as much as digits as its factorization.

1013775661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26460, while the sum is 37.

The square root of 1013775661 is about 31839.8439223562. The cubic root of 1013775661 is about 1004.5709614764.

The spelling of 1013775661 in words is "one billion, thirteen million, seven hundred seventy-five thousand, six hundred sixty-one".