63111281 has 2 divisors, whose sum is σ = 63111282. Its totient is φ = 63111280.

The previous prime is 63111277. The next prime is 63111289. The reversal of 63111281 is 18211136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37699600 + 25411681 = 6140^2 + 5041^2 .

It is a cyclic number.

It is not a de Polignac number, because 63111281 - 2² = 63111277 is a prime.

It is a super-2 number, since 2×63111281² = 7966067578921922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (63111289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31555640 + 31555641.

It is an arithmetic number, because the mean of its divisors is an integer number (31555641).

Almost surely, 2^63111281 is an apocalyptic number.

It is an amenable number.

63111281 is a deficient number, since it is larger than the sum of its proper divisors (1).

63111281 is an equidigital number, since it uses as much as digits as its factorization.

63111281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 23.

The square root of 63111281 is about 7944.2608844373. The cubic root of 63111281 is about 398.1398652389.

The spelling of 63111281 in words is "sixty-three million, one hundred eleven thousand, two hundred eighty-one".