68821451 has 4 divisors (see below), whose sum is σ = 71813712. Its totient is φ = 65829192.

The previous prime is 68821447. The next prime is 68821469. The reversal of 68821451 is 15412886.

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

It is a cyclic number.

It is not a de Polignac number, because 68821451 - 2² = 68821447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68821471) 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 in 3 ways as a sum of consecutive naturals, for example, 1496096 + ... + 1496141.

It is an arithmetic number, because the mean of its divisors is an integer number (17953428).

Almost surely, 2^68821451 is an apocalyptic number.

68821451 is a deficient number, since it is larger than the sum of its proper divisors (2992261).

68821451 is a wasteful number, since it uses less digits than its factorization.

68821451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2992260.

The product of its digits is 15360, while the sum is 35.

The square root of 68821451 is about 8295.8695144029. The cubic root of 68821451 is about 409.8025045255.

The spelling of 68821451 in words is "sixty-eight million, eight hundred twenty-one thousand, four hundred fifty-one".