1043623561 has 2 divisors, whose sum is σ = 1043623562. Its totient is φ = 1043623560.

The previous prime is 1043623531. The next prime is 1043623571. The reversal of 1043623561 is 1653263401.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 821166336 + 222457225 = 28656^2 + 14915^2 .

It is an emirp because it is prime and its reverse (1653263401) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1043623561 is a prime.

It is not a weakly prime, because it can be changed into another prime (1043623531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 521811780 + 521811781.

It is an arithmetic number, because the mean of its divisors is an integer number (521811781).

Almost surely, 2^1043623561 is an apocalyptic number.

It is an amenable number.

1043623561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1043623561 is an equidigital number, since it uses as much as digits as its factorization.

1043623561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 1043623561 is about 32305.1630703205. The cubic root of 1043623561 is about 1014.3347209231.

Adding to 1043623561 its reverse (1653263401), we get a palindrome (2696886962).

The spelling of 1043623561 in words is "one billion, forty-three million, six hundred twenty-three thousand, five hundred sixty-one".