121687347 has 4 divisors (see below), whose sum is σ = 162249800. Its totient is φ = 81124896.

The previous prime is 121687337. The next prime is 121687351. The reversal of 121687347 is 743786121.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 121687347 - 2⁶ = 121687283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121687337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20281222 + ... + 20281227.

It is an arithmetic number, because the mean of its divisors is an integer number (40562450).

Almost surely, 2^121687347 is an apocalyptic number.

121687347 is a deficient number, since it is larger than the sum of its proper divisors (40562453).

121687347 is an equidigital number, since it uses as much as digits as its factorization.

121687347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40562452.

The product of its digits is 56448, while the sum is 39.

The square root of 121687347 is about 11031.1988015809. The cubic root of 121687347 is about 495.5435270391.

The spelling of 121687347 in words is "one hundred twenty-one million, six hundred eighty-seven thousand, three hundred forty-seven".