63690997 has 2 divisors, whose sum is σ = 63690998. Its totient is φ = 63690996.

The previous prime is 63690953. The next prime is 63691009. The reversal of 63690997 is 79909636.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54774801 + 8916196 = 7401^2 + 2986^2 .

It is a cyclic number.

It is not a de Polignac number, because 63690997 - 2¹⁹ = 63166709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 63690997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63690397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31845498 + 31845499.

It is an arithmetic number, because the mean of its divisors is an integer number (31845499).

Almost surely, 2^63690997 is an apocalyptic number.

It is an amenable number.

63690997 is a deficient number, since it is larger than the sum of its proper divisors (1).

63690997 is an equidigital number, since it uses as much as digits as its factorization.

63690997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 551124, while the sum is 49.

The square root of 63690997 is about 7980.6639448106. The cubic root of 63690997 is about 399.3552049067.

The spelling of 63690997 in words is "sixty-three million, six hundred ninety thousand, nine hundred ninety-seven".