63031561 has 2 divisors, whose sum is σ = 63031562. Its totient is φ = 63031560.

The previous prime is 63031543. The next prime is 63031583. The reversal of 63031561 is 16513036.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53071225 + 9960336 = 7285^2 + 3156^2 .

It is a cyclic number.

It is not a de Polignac number, because 63031561 - 2²³ = 54642953 is a prime.

It is not a weakly prime, because it can be changed into another prime (63031541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31515780 + 31515781.

It is an arithmetic number, because the mean of its divisors is an integer number (31515781).

Almost surely, 2^63031561 is an apocalyptic number.

It is an amenable number.

63031561 is a deficient number, since it is larger than the sum of its proper divisors (1).

63031561 is an equidigital number, since it uses as much as digits as its factorization.

63031561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 63031561 is about 7939.2418403775. The cubic root of 63031561 is about 397.9721557417.

Adding to 63031561 its reverse (16513036), we get a palindrome (79544597).

The spelling of 63031561 in words is "sixty-three million, thirty-one thousand, five hundred sixty-one".