68517961 has 2 divisors, whose sum is σ = 68517962. Its totient is φ = 68517960.

The previous prime is 68517949. The next prime is 68517983. The reversal of 68517961 is 16971586.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55056400 + 13461561 = 7420^2 + 3669^2 .

It is a cyclic number.

It is not a de Polignac number, because 68517961 - 2¹¹ = 68515913 is a prime.

It is not a weakly prime, because it can be changed into another prime (68517901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34258980 + 34258981.

It is an arithmetic number, because the mean of its divisors is an integer number (34258981).

Almost surely, 2^68517961 is an apocalyptic number.

It is an amenable number.

68517961 is a deficient number, since it is larger than the sum of its proper divisors (1).

68517961 is an equidigital number, since it uses as much as digits as its factorization.

68517961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 43.

The square root of 68517961 is about 8277.5576711975. The cubic root of 68517961 is about 409.1992322065.

The spelling of 68517961 in words is "sixty-eight million, five hundred seventeen thousand, nine hundred sixty-one".