63261881 has 2 divisors, whose sum is σ = 63261882. Its totient is φ = 63261880.

The previous prime is 63261871. The next prime is 63261883. The reversal of 63261881 is 18816236.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62647225 + 614656 = 7915^2 + 784^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63261881 is a prime.

It is a super-2 number, since 2×63261881² = 8004131175316322, which contains 22 as substring.

Together with 63261883, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (63261883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31630940 + 31630941.

It is an arithmetic number, because the mean of its divisors is an integer number (31630941).

Almost surely, 2^63261881 is an apocalyptic number.

It is an amenable number.

63261881 is a deficient number, since it is larger than the sum of its proper divisors (1).

63261881 is an equidigital number, since it uses as much as digits as its factorization.

63261881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 35.

The square root of 63261881 is about 7953.7337772898. The cubic root of 63261881 is about 398.4563022402.

The spelling of 63261881 in words is "sixty-three million, two hundred sixty-one thousand, eight hundred eighty-one".