63431561 has 2 divisors, whose sum is σ = 63431562. Its totient is φ = 63431560.

The previous prime is 63431531. The next prime is 63431581. The reversal of 63431561 is 16513436.

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., 58049161 + 5382400 = 7619^2 + 2320^2 .

It is a cyclic number.

It is not a de Polignac number, because 63431561 - 2¹⁸ = 63169417 is a prime.

It is not a weakly prime, because it can be changed into another prime (63431531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31715780 + 31715781.

It is an arithmetic number, because the mean of its divisors is an integer number (31715781).

Almost surely, 2^63431561 is an apocalyptic number.

It is an amenable number.

63431561 is a deficient number, since it is larger than the sum of its proper divisors (1).

63431561 is an equidigital number, since it uses as much as digits as its factorization.

63431561 is an odious number, because the sum of its binary digits is odd.

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

The square root of 63431561 is about 7964.3933227836. The cubic root of 63431561 is about 398.8122285720.

Adding to 63431561 its reverse (16513436), we get a palindrome (79944997).

The spelling of 63431561 in words is "sixty-three million, four hundred thirty-one thousand, five hundred sixty-one".