121681847 has 12 divisors (see below), whose sum is σ = 141745320. Its totient is φ = 104153616.

The previous prime is 121681843. The next prime is 121681867. The reversal of 121681847 is 748186121.

It is a happy number.

It is not a de Polignac number, because 121681847 - 2² = 121681843 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121681847.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121681843) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48713 + ... + 51149.

It is an arithmetic number, because the mean of its divisors is an integer number (11812110).

Almost surely, 2^121681847 is an apocalyptic number.

121681847 is a deficient number, since it is larger than the sum of its proper divisors (20063473).

121681847 is a wasteful number, since it uses less digits than its factorization.

121681847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3470 (or 3463 counting only the distinct ones).

The product of its digits is 21504, while the sum is 38.

The square root of 121681847 is about 11030.9495058222. The cubic root of 121681847 is about 495.5360611014.

The spelling of 121681847 in words is "one hundred twenty-one million, six hundred eighty-one thousand, eight hundred forty-seven".