63487181 has 2 divisors, whose sum is σ = 63487182. Its totient is φ = 63487180.

The previous prime is 63487111. The next prime is 63487201. The reversal of 63487181 is 18178436.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42784681 + 20702500 = 6541^2 + 4550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63487181 is a prime.

It is a super-2 number, since 2×63487181² = 8061244302653522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_3756467 and since 63487181 and 3756467 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63487111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31743590 + 31743591.

It is an arithmetic number, because the mean of its divisors is an integer number (31743591).

Almost surely, 2^63487181 is an apocalyptic number.

It is an amenable number.

63487181 is a deficient number, since it is larger than the sum of its proper divisors (1).

63487181 is an equidigital number, since it uses as much as digits as its factorization.

63487181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 38.

The square root of 63487181 is about 7967.8843490603. The cubic root of 63487181 is about 398.9287607606.

The spelling of 63487181 in words is "sixty-three million, four hundred eighty-seven thousand, one hundred eighty-one".