63681131 has 2 divisors, whose sum is σ = 63681132. Its totient is φ = 63681130.

The previous prime is 63681109. The next prime is 63681139. The reversal of 63681131 is 13118636.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63681131 - 2¹⁴ = 63664747 is a prime.

It is a super-2 number, since 2×63681131² = 8110572890878322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 63681094 and 63681103.

It is not a weakly prime, because it can be changed into another prime (63681139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31840565 + 31840566.

It is an arithmetic number, because the mean of its divisors is an integer number (31840566).

Almost surely, 2^63681131 is an apocalyptic number.

63681131 is a deficient number, since it is larger than the sum of its proper divisors (1).

63681131 is an equidigital number, since it uses as much as digits as its factorization.

63681131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 29.

The square root of 63681131 is about 7980.0458018736. The cubic root of 63681131 is about 399.3345832485.

Adding to 63681131 its reverse (13118636), we get a palindrome (76799767).

The spelling of 63681131 in words is "sixty-three million, six hundred eighty-one thousand, one hundred thirty-one".