63486991 has 2 divisors, whose sum is σ = 63486992. Its totient is φ = 63486990.

The previous prime is 63486979. The next prime is 63487001. The reversal of 63486991 is 19968436.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63486991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63486971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31743495 + 31743496.

It is an arithmetic number, because the mean of its divisors is an integer number (31743496).

Almost surely, 2^63486991 is an apocalyptic number.

63486991 is a deficient number, since it is larger than the sum of its proper divisors (1).

63486991 is an equidigital number, since it uses as much as digits as its factorization.

63486991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 46.

The square root of 63486991 is about 7967.8724261876. The cubic root of 63486991 is about 398.9283627982.

The spelling of 63486991 in words is "sixty-three million, four hundred eighty-six thousand, nine hundred ninety-one".