121626261 has 18 divisors (see below), whose sum is σ = 181960610. Its totient is φ = 78283296.

The previous prime is 121626247. The next prime is 121626283. The reversal of 121626261 is 162626121.

121626261 is a `hidden beast` number, since 12 + 1 + 626 + 26 + 1 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 9922500 + 111703761 = 3150^2 + 10569^2 .

It is not a de Polignac number, because 121626261 - 2⁵ = 121626229 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121626221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 466 + ... + 15603.

Almost surely, 2^121626261 is an apocalyptic number.

It is an amenable number.

121626261 is a deficient number, since it is larger than the sum of its proper divisors (60334349).

121626261 is a wasteful number, since it uses less digits than its factorization.

121626261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16133 (or 16101 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 121626261 is about 11028.4296706285. The cubic root of 121626261 is about 495.4605936330.

The spelling of 121626261 in words is "one hundred twenty-one million, six hundred twenty-six thousand, two hundred sixty-one".