121500261 has 12 divisors (see below), whose sum is σ = 179781420. Its totient is φ = 79024320.

The previous prime is 121500167. The next prime is 121500263. The reversal of 121500261 is 162005121.

It can be written as a sum of positive squares in 2 ways, for example, as 20196036 + 101304225 = 4494^2 + 10065^2 .

It is not a de Polignac number, because 121500261 - 2¹⁰ = 121499237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121500263) 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 11 ways as a sum of consecutive naturals, for example, 164266 + ... + 165003.

It is an arithmetic number, because the mean of its divisors is an integer number (14981785).

Almost surely, 2^121500261 is an apocalyptic number.

It is an amenable number.

121500261 is a deficient number, since it is larger than the sum of its proper divisors (58281159).

121500261 is a wasteful number, since it uses less digits than its factorization.

121500261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329316 (or 329313 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 121500261 is about 11022.7156817184. The cubic root of 121500261 is about 495.2894419854.

Adding to 121500261 its reverse (162005121), we get a palindrome (283505382).

The spelling of 121500261 in words is "one hundred twenty-one million, five hundred thousand, two hundred sixty-one".