68498921 has 4 divisors (see below), whose sum is σ = 68529744. Its totient is φ = 68468100.

The previous prime is 68498917. The next prime is 68498923. The reversal of 68498921 is 12989486.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12989486 = 2 ⋅6494743.

It is a cyclic number.

It is not a de Polignac number, because 68498921 - 2² = 68498917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68498923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11795 + ... + 16616.

It is an arithmetic number, because the mean of its divisors is an integer number (17132436).

Almost surely, 2^68498921 is an apocalyptic number.

It is an amenable number.

68498921 is a deficient number, since it is larger than the sum of its proper divisors (30823).

68498921 is a wasteful number, since it uses less digits than its factorization.

68498921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30822.

The product of its digits is 248832, while the sum is 47.

The square root of 68498921 is about 8276.4074935929. The cubic root of 68498921 is about 409.1613254783.

The spelling of 68498921 in words is "sixty-eight million, four hundred ninety-eight thousand, nine hundred twenty-one".