63781457 has 2 divisors, whose sum is σ = 63781458. Its totient is φ = 63781456.

The previous prime is 63781453. The next prime is 63781481. The reversal of 63781457 is 75418736.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52765696 + 11015761 = 7264^2 + 3319^2 .

It is a cyclic number.

It is not a de Polignac number, because 63781457 - 2² = 63781453 is a prime.

It is not a weakly prime, because it can be changed into another prime (63781453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31890728 + 31890729.

It is an arithmetic number, because the mean of its divisors is an integer number (31890729).

Almost surely, 2^63781457 is an apocalyptic number.

It is an amenable number.

63781457 is a deficient number, since it is larger than the sum of its proper divisors (1).

63781457 is an equidigital number, since it uses as much as digits as its factorization.

63781457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 41.

The square root of 63781457 is about 7986.3293821380. The cubic root of 63781457 is about 399.5441828575.

The spelling of 63781457 in words is "sixty-three million, seven hundred eighty-one thousand, four hundred fifty-seven".