63691457 has 2 divisors, whose sum is σ = 63691458. Its totient is φ = 63691456.

The previous prime is 63691451. The next prime is 63691493. The reversal of 63691457 is 75419636.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60855601 + 2835856 = 7801^2 + 1684^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63691457 is a prime.

It is not a weakly prime, because it can be changed into another prime (63691451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31845728 + 31845729.

It is an arithmetic number, because the mean of its divisors is an integer number (31845729).

Almost surely, 2^63691457 is an apocalyptic number.

It is an amenable number.

63691457 is a deficient number, since it is larger than the sum of its proper divisors (1).

63691457 is an equidigital number, since it uses as much as digits as its factorization.

63691457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 41.

The square root of 63691457 is about 7980.6927644159. The cubic root of 63691457 is about 399.3561663349.

The spelling of 63691457 in words is "sixty-three million, six hundred ninety-one thousand, four hundred fifty-seven".