121931947 has 8 divisors (see below), whose sum is σ = 128495520. Its totient is φ = 115473600.

The previous prime is 121931899. The next prime is 121931951. The reversal of 121931947 is 749139121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121931947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121931977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23922 + ... + 28567.

It is an arithmetic number, because the mean of its divisors is an integer number (16061940).

Almost surely, 2^121931947 is an apocalyptic number.

121931947 is a deficient number, since it is larger than the sum of its proper divisors (6563573).

121931947 is a wasteful number, since it uses less digits than its factorization.

121931947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52613.

The product of its digits is 13608, while the sum is 37.

The square root of 121931947 is about 11042.2799729041. The cubic root of 121931947 is about 495.8753304320.

The spelling of 121931947 in words is "one hundred twenty-one million, nine hundred thirty-one thousand, nine hundred forty-seven".