1023415661 has 2 divisors, whose sum is σ = 1023415662. Its totient is φ = 1023415660.

The previous prime is 1023415649. The next prime is 1023415693. The reversal of 1023415661 is 1665143201.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 945870025 + 77545636 = 30755^2 + 8806^2 .

It is an emirp because it is prime and its reverse (1665143201) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1023415661 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1023412661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 511707830 + 511707831.

It is an arithmetic number, because the mean of its divisors is an integer number (511707831).

Almost surely, 2^1023415661 is an apocalyptic number.

It is an amenable number.

1023415661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1023415661 is an equidigital number, since it uses as much as digits as its factorization.

1023415661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1023415661 is about 31990.8684002170. The cubic root of 1023415661 is about 1007.7450792152.

Adding to 1023415661 its reverse (1665143201), we get a palindrome (2688558862).

The spelling of 1023415661 in words is "one billion, twenty-three million, four hundred fifteen thousand, six hundred sixty-one".