1065550961 has 2 divisors, whose sum is σ = 1065550962. Its totient is φ = 1065550960.

The previous prime is 1065550943. The next prime is 1065551017. The reversal of 1065550961 is 1690555601.

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., 1057485361 + 8065600 = 32519^2 + 2840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1065550961 is a prime.

It is a super-2 number, since 2×1065550961² = 2270797700976047042, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1065550061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 532775480 + 532775481.

It is an arithmetic number, because the mean of its divisors is an integer number (532775481).

Almost surely, 2^1065550961 is an apocalyptic number.

It is an amenable number.

1065550961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1065550961 is an equidigital number, since it uses as much as digits as its factorization.

1065550961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40500, while the sum is 38.

The square root of 1065550961 is about 32642.7780833678. The cubic root of 1065550961 is about 1021.3895456732.

It can be divided in two parts, 10655 and 50961, that added together give a palindrome (61616).

The spelling of 1065550961 in words is "one billion, sixty-five million, five hundred fifty thousand, nine hundred sixty-one".