63681731 has 2 divisors, whose sum is σ = 63681732. Its totient is φ = 63681730.

The previous prime is 63681727. The next prime is 63681763. The reversal of 63681731 is 13718636.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 63681731 - 2² = 63681727 is a prime.

It is a super-2 number, since 2×63681731² = 8110725726312722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 63681691 and 63681700.

It is not a weakly prime, because it can be changed into another prime (63681721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31840865 + 31840866.

It is an arithmetic number, because the mean of its divisors is an integer number (31840866).

Almost surely, 2^63681731 is an apocalyptic number.

63681731 is a deficient number, since it is larger than the sum of its proper divisors (1).

63681731 is an equidigital number, since it uses as much as digits as its factorization.

63681731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 35.

The square root of 63681731 is about 7980.0833955542. The cubic root of 63681731 is about 399.3358374138.

The spelling of 63681731 in words is "sixty-three million, six hundred eighty-one thousand, seven hundred thirty-one".