63961409 has 2 divisors, whose sum is σ = 63961410. Its totient is φ = 63961408.

The previous prime is 63961393. The next prime is 63961421. The reversal of 63961409 is 90416936.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53333809 + 10627600 = 7303^2 + 3260^2 .

It is a cyclic number.

It is not a de Polignac number, because 63961409 - 2⁴ = 63961393 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_3782945 and since 63961409 and 3782945 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (63964409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31980704 + 31980705.

It is an arithmetic number, because the mean of its divisors is an integer number (31980705).

Almost surely, 2^63961409 is an apocalyptic number.

It is an amenable number.

63961409 is a deficient number, since it is larger than the sum of its proper divisors (1).

63961409 is an equidigital number, since it uses as much as digits as its factorization.

63961409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 63961409 is about 7997.5876988002. The cubic root of 63961409 is about 399.9195859184.

The spelling of 63961409 in words is "sixty-three million, nine hundred sixty-one thousand, four hundred nine".