121312518 has 16 divisors (see below), whose sum is σ = 245352240. Its totient is φ = 39982976.

The previous prime is 121312501. The next prime is 121312537. The reversal of 121312518 is 815213121.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 113055 + ... + 114122.

It is an arithmetic number, because the mean of its divisors is an integer number (15334515).

Almost surely, 2^121312518 is an apocalyptic number.

121312518 is an abundant number, since it is smaller than the sum of its proper divisors (124039722).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121312518 is a wasteful number, since it uses less digits than its factorization.

121312518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227271.

The product of its digits is 480, while the sum is 24.

The square root of 121312518 is about 11014.1962030826. The cubic root of 121312518 is about 495.0342023097.

Adding to 121312518 its reverse (815213121), we get a palindrome (936525639).

It can be divided in two parts, 1213 and 12518, that added together give a palindrome (13731).

The spelling of 121312518 in words is "one hundred twenty-one million, three hundred twelve thousand, five hundred eighteen".