121315161 has 16 divisors (see below), whose sum is σ = 177363648. Its totient is φ = 73147200.

The previous prime is 121315127. The next prime is 121315163. The reversal of 121315161 is 161513121.

It is a happy number.

It is not a de Polignac number, because 121315161 - 2⁹ = 121314649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121315163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2830 + ... + 15831.

It is an arithmetic number, because the mean of its divisors is an integer number (11085228).

Almost surely, 2^121315161 is an apocalyptic number.

121315161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121315161 is a deficient number, since it is larger than the sum of its proper divisors (56048487).

121315161 is a wasteful number, since it uses less digits than its factorization.

121315161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18872.

The product of its digits is 180, while the sum is 21.

The square root of 121315161 is about 11014.3161839490. The cubic root of 121315161 is about 495.0377973383.

Adding to 121315161 its reverse (161513121), we get a palindrome (282828282).

The spelling of 121315161 in words is "one hundred twenty-one million, three hundred fifteen thousand, one hundred sixty-one".