1019011661 has 2 divisors, whose sum is σ = 1019011662. Its totient is φ = 1019011660.

The previous prime is 1019011627. The next prime is 1019011673. The reversal of 1019011661 is 1661109101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 965282761 + 53728900 = 31069^2 + 7330^2 .

It is an emirp because it is prime and its reverse (1661109101) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 1991106101 and 1016011991.

It is a cyclic number.

It is not a de Polignac number, because 1019011661 - 2¹⁴ = 1018995277 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1019011661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1019011601) 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, 509505830 + 509505831.

It is an arithmetic number, because the mean of its divisors is an integer number (509505831).

Almost surely, 2^1019011661 is an apocalyptic number.

It is an amenable number.

1019011661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1019011661 is an equidigital number, since it uses as much as digits as its factorization.

1019011661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 26.

The square root of 1019011661 is about 31921.9620480947. The cubic root of 1019011661 is about 1006.2974788446.

The spelling of 1019011661 in words is "one billion, nineteen million, eleven thousand, six hundred sixty-one".