68931649 has 2 divisors, whose sum is σ = 68931650. Its totient is φ = 68931648.

The previous prime is 68931613. The next prime is 68931661. The reversal of 68931649 is 94613986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47169424 + 21762225 = 6868^2 + 4665^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68931649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68931599 and 68931608.

It is not a weakly prime, because it can be changed into another prime (68931689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34465824 + 34465825.

It is an arithmetic number, because the mean of its divisors is an integer number (34465825).

Almost surely, 2^68931649 is an apocalyptic number.

It is an amenable number.

68931649 is a deficient number, since it is larger than the sum of its proper divisors (1).

68931649 is an equidigital number, since it uses as much as digits as its factorization.

68931649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 46.

The square root of 68931649 is about 8302.5085968037. The cubic root of 68931649 is about 410.0211153115.

The spelling of 68931649 in words is "sixty-eight million, nine hundred thirty-one thousand, six hundred forty-nine".