68513121 has 12 divisors (see below), whose sum is σ = 102629072. Its totient is φ = 45675252.

The previous prime is 68513099. The next prime is 68513161. The reversal of 68513121 is 12131586.

It is not a de Polignac number, because 68513121 - 2⁵ = 68513089 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68513161) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 140731 + ... + 141216.

Almost surely, 2^68513121 is an apocalyptic number.

It is an amenable number.

68513121 is a deficient number, since it is larger than the sum of its proper divisors (34115951).

68513121 is an equidigital number, since it uses as much as digits as its factorization.

68513121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281962 (or 281950 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 68513121 is about 8277.2653092673. The cubic root of 68513121 is about 409.1895969182.

The spelling of 68513121 in words is "sixty-eight million, five hundred thirteen thousand, one hundred twenty-one".