63150781 has 2 divisors, whose sum is σ = 63150782. Its totient is φ = 63150780.

The previous prime is 63150779. The next prime is 63150797. The reversal of 63150781 is 18705136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51351556 + 11799225 = 7166^2 + 3435^2 .

It is a cyclic number.

It is not a de Polignac number, because 63150781 - 2¹ = 63150779 is a prime.

It is a super-2 number, since 2×63150781² = 7976042281819922, which contains 22 as substring.

Together with 63150779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63150721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31575390 + 31575391.

It is an arithmetic number, because the mean of its divisors is an integer number (31575391).

Almost surely, 2^63150781 is an apocalyptic number.

It is an amenable number.

63150781 is a deficient number, since it is larger than the sum of its proper divisors (1).

63150781 is an equidigital number, since it uses as much as digits as its factorization.

63150781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 63150781 is about 7946.7465669921. The cubic root of 63150781 is about 398.2229103226. Note that the first 3 decimals are identical.

The spelling of 63150781 in words is "sixty-three million, one hundred fifty thousand, seven hundred eighty-one".