63982991 has 2 divisors, whose sum is σ = 63982992. Its totient is φ = 63982990.

The previous prime is 63982943. The next prime is 63983009. The reversal of 63982991 is 19928936.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63982991 - 2¹⁴ = 63966607 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63982691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31991495 + 31991496.

It is an arithmetic number, because the mean of its divisors is an integer number (31991496).

Almost surely, 2^63982991 is an apocalyptic number.

63982991 is a deficient number, since it is larger than the sum of its proper divisors (1).

63982991 is an equidigital number, since it uses as much as digits as its factorization.

63982991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 47.

The square root of 63982991 is about 7998.9368668592. The cubic root of 63982991 is about 399.9645614437.

The spelling of 63982991 in words is "sixty-three million, nine hundred eighty-two thousand, nine hundred ninety-one".