68997521 has 2 divisors, whose sum is σ = 68997522. Its totient is φ = 68997520.

The previous prime is 68997503. The next prime is 68997529. The reversal of 68997521 is 12579986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49505296 + 19492225 = 7036^2 + 4415^2 .

It is a cyclic number.

It is not a de Polignac number, because 68997521 - 2¹⁰ = 68996497 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68997529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34498760 + 34498761.

It is an arithmetic number, because the mean of its divisors is an integer number (34498761).

Almost surely, 2^68997521 is an apocalyptic number.

It is an amenable number.

68997521 is a deficient number, since it is larger than the sum of its proper divisors (1).

68997521 is an equidigital number, since it uses as much as digits as its factorization.

68997521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 47.

The square root of 68997521 is about 8306.4746433129. The cubic root of 68997521 is about 410.1516809395.

The spelling of 68997521 in words is "sixty-eight million, nine hundred ninety-seven thousand, five hundred twenty-one".