121975855 has 8 divisors (see below), whose sum is σ = 151092864. Its totient is φ = 94432800.

The previous prime is 121975853. The next prime is 121975873. The reversal of 121975855 is 558579121.

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

It is not a de Polignac number, because 121975855 - 2¹ = 121975853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121975853) 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, 393316 + ... + 393625.

It is an arithmetic number, because the mean of its divisors is an integer number (18886608).

Almost surely, 2^121975855 is an apocalyptic number.

121975855 is a deficient number, since it is larger than the sum of its proper divisors (29117009).

121975855 is an equidigital number, since it uses as much as digits as its factorization.

121975855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786977.

The product of its digits is 126000, while the sum is 43.

The square root of 121975855 is about 11044.2679703093. The cubic root of 121975855 is about 495.9348452723.

The spelling of 121975855 in words is "one hundred twenty-one million, nine hundred seventy-five thousand, eight hundred fifty-five".