63561961 has 2 divisors, whose sum is σ = 63561962. Its totient is φ = 63561960.

The previous prime is 63561937. The next prime is 63561983. The reversal of 63561961 is 16916536.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39000025 + 24561936 = 6245^2 + 4956^2 .

It is a cyclic number.

It is not a de Polignac number, because 63561961 - 2¹⁷ = 63430889 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 63561961.

It is not a weakly prime, because it can be changed into another prime (63561991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31780980 + 31780981.

It is an arithmetic number, because the mean of its divisors is an integer number (31780981).

Almost surely, 2^63561961 is an apocalyptic number.

It is an amenable number.

63561961 is a deficient number, since it is larger than the sum of its proper divisors (1).

63561961 is an equidigital number, since it uses as much as digits as its factorization.

63561961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29160, while the sum is 37.

The square root of 63561961 is about 7972.5755562428. The cubic root of 63561961 is about 399.0853287857.

The spelling of 63561961 in words is "sixty-three million, five hundred sixty-one thousand, nine hundred sixty-one".