63740581 has 2 divisors, whose sum is σ = 63740582. Its totient is φ = 63740580.

The previous prime is 63740563. The next prime is 63740629. The reversal of 63740581 is 18504736.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44957025 + 18783556 = 6705^2 + 4334^2 .

It is a cyclic number.

It is not a de Polignac number, because 63740581 - 2⁵ = 63740549 is a prime.

It is a super-2 number, since 2×63740581² = 8125723332435122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63740081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31870290 + 31870291.

It is an arithmetic number, because the mean of its divisors is an integer number (31870291).

Almost surely, 2^63740581 is an apocalyptic number.

It is an amenable number.

63740581 is a deficient number, since it is larger than the sum of its proper divisors (1).

63740581 is an equidigital number, since it uses as much as digits as its factorization.

63740581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 63740581 is about 7983.7698488872. The cubic root of 63740581 is about 399.4588118687.

The spelling of 63740581 in words is "sixty-three million, seven hundred forty thousand, five hundred eighty-one".