68424521 has 4 divisors (see below), whose sum is σ = 74644944. Its totient is φ = 62204100.

The previous prime is 68424509. The next prime is 68424523. The reversal of 68424521 is 12542486.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68424521 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68424523) 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, 3110195 + ... + 3110216.

It is an arithmetic number, because the mean of its divisors is an integer number (18661236).

Almost surely, 2^68424521 is an apocalyptic number.

It is an amenable number.

68424521 is a deficient number, since it is larger than the sum of its proper divisors (6220423).

68424521 is a wasteful number, since it uses less digits than its factorization.

68424521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6220422.

The product of its digits is 15360, while the sum is 32.

The square root of 68424521 is about 8271.9115686763. The cubic root of 68424521 is about 409.0131351604.

The spelling of 68424521 in words is "sixty-eight million, four hundred twenty-four thousand, five hundred twenty-one".