121782261 has 8 divisors (see below), whose sum is σ = 162436480. Its totient is φ = 81158112.

The previous prime is 121782257. The next prime is 121782293. The reversal of 121782261 is 162287121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121782261 - 2² = 121782257 is a prime.

It is the 11036-th Hogben number.

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 (121782161) by changing a digit.

It is a nontrivial repunit in base 11035.

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 7 ways as a sum of consecutive naturals, for example, 4836 + ... + 16338.

It is an arithmetic number, because the mean of its divisors is an integer number (20304560).

Almost surely, 2^121782261 is an apocalyptic number.

It is an amenable number.

121782261 is a deficient number, since it is larger than the sum of its proper divisors (40654219).

121782261 is a wasteful number, since it uses less digits than its factorization.

121782261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15035.

The product of its digits is 2688, while the sum is 30.

The square root of 121782261 is about 11035.5000339812. The cubic root of 121782261 is about 495.6723319812.

The spelling of 121782261 in words is "one hundred twenty-one million, seven hundred eighty-two thousand, two hundred sixty-one".