1365142561 has 2 divisors, whose sum is σ = 1365142562. Its totient is φ = 1365142560.

The previous prime is 1365142553. The next prime is 1365142579. The reversal of 1365142561 is 1652415631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 742889536 + 622253025 = 27256^2 + 24945^2 .

It is a cyclic number.

It is not a de Polignac number, because 1365142561 - 2³ = 1365142553 is a prime.

It is a super-2 number, since 2×1365142561² = 3727228423707277442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1365142511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 682571280 + 682571281.

It is an arithmetic number, because the mean of its divisors is an integer number (682571281).

Almost surely, 2^1365142561 is an apocalyptic number.

It is an amenable number.

1365142561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1365142561 is an equidigital number, since it uses as much as digits as its factorization.

1365142561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 34.

The square root of 1365142561 is about 36947.8356740960. The cubic root of 1365142561 is about 1109.3263669652.

The spelling of 1365142561 in words is "one billion, three hundred sixty-five million, one hundred forty-two thousand, five hundred sixty-one".