1301145661 has 2 divisors, whose sum is σ = 1301145662. Its totient is φ = 1301145660.

The previous prime is 1301145653. The next prime is 1301145667. The reversal of 1301145661 is 1665411031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 740166436 + 560979225 = 27206^2 + 23685^2 .

It is an emirp because it is prime and its reverse (1665411031) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1301145661 - 2³ = 1301145653 is a prime.

It is a super-2 number, since 2×1301145661² = 3385960062278253842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1301145667) 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, 650572830 + 650572831.

It is an arithmetic number, because the mean of its divisors is an integer number (650572831).

Almost surely, 2^1301145661 is an apocalyptic number.

It is an amenable number.

1301145661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1301145661 is an equidigital number, since it uses as much as digits as its factorization.

1301145661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 1301145661 is about 36071.3967154032. The cubic root of 1301145661 is about 1091.7133956598.

Adding to 1301145661 its reverse (1665411031), we get a palindrome (2966556692).

The spelling of 1301145661 in words is "one billion, three hundred one million, one hundred forty-five thousand, six hundred sixty-one".