403316561 has 2 divisors, whose sum is σ = 403316562. Its totient is φ = 403316560.

The previous prime is 403316527. The next prime is 403316581. The reversal of 403316561 is 165613304.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 402604225 + 712336 = 20065^2 + 844^2 .

It is a cyclic number.

It is not a de Polignac number, because 403316561 - 2¹⁰ = 403315537 is a prime.

It is not a weakly prime, because it can be changed into another prime (403316581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201658280 + 201658281.

It is an arithmetic number, because the mean of its divisors is an integer number (201658281).

Almost surely, 2^403316561 is an apocalyptic number.

It is an amenable number.

403316561 is a deficient number, since it is larger than the sum of its proper divisors (1).

403316561 is an equidigital number, since it uses as much as digits as its factorization.

403316561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 403316561 is about 20082.7428654554. The cubic root of 403316561 is about 738.8370832111.

Adding to 403316561 its reverse (165613304), we get a palindrome (568929865).

The spelling of 403316561 in words is "four hundred three million, three hundred sixteen thousand, five hundred sixty-one".