68635261 has 2 divisors, whose sum is σ = 68635262. Its totient is φ = 68635260.

The previous prime is 68635247. The next prime is 68635283. The reversal of 68635261 is 16253686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45306361 + 23328900 = 6731^2 + 4830^2 .

It is a cyclic number.

It is not a de Polignac number, because 68635261 - 2¹⁵ = 68602493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68635261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68635291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34317630 + 34317631.

It is an arithmetic number, because the mean of its divisors is an integer number (34317631).

Almost surely, 2^68635261 is an apocalyptic number.

It is an amenable number.

68635261 is a deficient number, since it is larger than the sum of its proper divisors (1).

68635261 is an equidigital number, since it uses as much as digits as its factorization.

68635261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 37.

The square root of 68635261 is about 8284.6400646015. The cubic root of 68635261 is about 409.4326099682.

The spelling of 68635261 in words is "sixty-eight million, six hundred thirty-five thousand, two hundred sixty-one".