68121499 has 4 divisors (see below), whose sum is σ = 72128664. Its totient is φ = 64114336.

The previous prime is 68121497. The next prime is 68121523. The reversal of 68121499 is 99412186.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99412186 = 2 ⋅49706093.

It is a cyclic number.

It is not a de Polignac number, because 68121499 - 2¹ = 68121497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68121497) 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, 2003557 + ... + 2003590.

It is an arithmetic number, because the mean of its divisors is an integer number (18032166).

Almost surely, 2^68121499 is an apocalyptic number.

68121499 is a deficient number, since it is larger than the sum of its proper divisors (4007165).

68121499 is a wasteful number, since it uses less digits than its factorization.

68121499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4007164.

The product of its digits is 31104, while the sum is 40.

The square root of 68121499 is about 8253.5749224200. The cubic root of 68121499 is about 408.4084621261.

The spelling of 68121499 in words is "sixty-eight million, one hundred twenty-one thousand, four hundred ninety-nine".