121975 has 24 divisors (see below), whose sum is σ = 187488. Its totient is φ = 76800.

The previous prime is 121967. The next prime is 121993. The reversal of 121975 is 579121.

121975 is nontrivially palindromic in base 2.

It is not a de Polignac number, because 121975 - 2³ = 121967 is a prime.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (25).

Its product of digits (630) is a multiple of the sum of its prime divisors (70).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2955 + ... + 2995.

It is an arithmetic number, because the mean of its divisors is an integer number (7812).

2¹²¹⁹⁷⁵ is an apocalyptic number.

121975 is the 175-th decagonal number.

121975 is a deficient number, since it is larger than the sum of its proper divisors (65513).

121975 is a wasteful number, since it uses less digits than its factorization.

121975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75 (or 70 counting only the distinct ones).

The product of its digits is 630, while the sum is 25.

The square root of 121975 is about 349.2491947020. The cubic root of 121975 is about 49.5933686504.

The spelling of 121975 in words is "one hundred twenty-one thousand, nine hundred seventy-five".