68250521 has 4 divisors (see below), whose sum is σ = 69369444. Its totient is φ = 67131600.

The previous prime is 68250487. The next prime is 68250571. The reversal of 68250521 is 12505286.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1990921 + 66259600 = 1411^2 + 8140^2 .

It is a cyclic number.

It is not a de Polignac number, because 68250521 - 2¹⁴ = 68234137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68250571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 559370 + ... + 559491.

It is an arithmetic number, because the mean of its divisors is an integer number (17342361).

Almost surely, 2^68250521 is an apocalyptic number.

68250521 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

68250521 is a deficient number, since it is larger than the sum of its proper divisors (1118923).

68250521 is a wasteful number, since it uses less digits than its factorization.

68250521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1118922.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 68250521 is about 8261.3873532234. The cubic root of 68250521 is about 408.6661411511. Note that the first 3 decimals are identical.

The spelling of 68250521 in words is "sixty-eight million, two hundred fifty thousand, five hundred twenty-one".