121555671 has 8 divisors (see below), whose sum is σ = 162462720. Its totient is φ = 80842872.

The previous prime is 121555649. The next prime is 121555699. The reversal of 121555671 is 176555121.

It is a happy number.

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

It is not a de Polignac number, because 121555671 - 2⁶ = 121555607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121555631) 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, 47095 + ... + 49608.

It is an arithmetic number, because the mean of its divisors is an integer number (20307840).

Almost surely, 2^121555671 is an apocalyptic number.

121555671 is a deficient number, since it is larger than the sum of its proper divisors (40907049).

121555671 is an equidigital number, since it uses as much as digits as its factorization.

121555671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97125.

The product of its digits is 10500, while the sum is 33.

The square root of 121555671 is about 11025.2288411624. The cubic root of 121555671 is about 495.3647225290.

The spelling of 121555671 in words is "one hundred twenty-one million, five hundred fifty-five thousand, six hundred seventy-one".