63725261 has 2 divisors, whose sum is σ = 63725262. Its totient is φ = 63725260.

The previous prime is 63725257. The next prime is 63725281. The reversal of 63725261 is 16252736.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63696361 + 28900 = 7981^2 + 170^2 .

It is a cyclic number.

It is not a de Polignac number, because 63725261 - 2² = 63725257 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63725281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31862630 + 31862631.

It is an arithmetic number, because the mean of its divisors is an integer number (31862631).

Almost surely, 2^63725261 is an apocalyptic number.

It is an amenable number.

63725261 is a deficient number, since it is larger than the sum of its proper divisors (1).

63725261 is an equidigital number, since it uses as much as digits as its factorization.

63725261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 32.

The square root of 63725261 is about 7982.8103447345. The cubic root of 63725261 is about 399.4268060975.

Adding to 63725261 its reverse (16252736), we get a palindrome (79977997).

The spelling of 63725261 in words is "sixty-three million, seven hundred twenty-five thousand, two hundred sixty-one".