121615172 has 24 divisors (see below), whose sum is σ = 243950784. Its totient is φ = 51966432.

The previous prime is 121615163. The next prime is 121615187. The reversal of 121615172 is 271516121.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3458 + ... + 15974.

It is an arithmetic number, because the mean of its divisors is an integer number (10164616).

Almost surely, 2^121615172 is an apocalyptic number.

It is an amenable number.

121615172 is an abundant number, since it is smaller than the sum of its proper divisors (122335612).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121615172 is a wasteful number, since it uses less digits than its factorization.

121615172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12875 (or 12873 counting only the distinct ones).

The product of its digits is 840, while the sum is 26.

The square root of 121615172 is about 11027.9269130694. The cubic root of 121615172 is about 495.4455356746.

The spelling of 121615172 in words is "one hundred twenty-one million, six hundred fifteen thousand, one hundred seventy-two".