68757121 has 4 divisors (see below), whose sum is σ = 68778544. Its totient is φ = 68735700.

The previous prime is 68757113. The next prime is 68757127. The reversal of 68757121 is 12175786.

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 not a de Polignac number, because 68757121 - 2³ = 68757113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68757127) 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, 4815 + ... + 12676.

It is an arithmetic number, because the mean of its divisors is an integer number (17194636).

Almost surely, 2^68757121 is an apocalyptic number.

It is an amenable number.

68757121 is a deficient number, since it is larger than the sum of its proper divisors (21423).

68757121 is a wasteful number, since it uses less digits than its factorization.

68757121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21422.

The product of its digits is 23520, while the sum is 37.

The square root of 68757121 is about 8291.9913772266. The cubic root of 68757121 is about 409.6747787799.

The spelling of 68757121 in words is "sixty-eight million, seven hundred fifty-seven thousand, one hundred twenty-one".