121643125 has 20 divisors (see below), whose sum is σ = 152951040. Its totient is φ = 96710000.

The previous prime is 121643099. The next prime is 121643131. The reversal of 121643125 is 521346121.

It is a happy number.

It is not a de Polignac number, because 121643125 - 2¹¹ = 121641077 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 121643125.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 118866 + ... + 119884.

It is an arithmetic number, because the mean of its divisors is an integer number (7647552).

Almost surely, 2^121643125 is an apocalyptic number.

It is an amenable number.

121643125 is a deficient number, since it is larger than the sum of its proper divisors (31307915).

121643125 is an equidigital number, since it uses as much as digits as its factorization.

121643125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1230 (or 1215 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 121643125 is about 11029.1942135407. The cubic root of 121643125 is about 495.4834918164.

Adding to 121643125 its reverse (521346121), we get a palindrome (642989246).

The spelling of 121643125 in words is "one hundred twenty-one million, six hundred forty-three thousand, one hundred twenty-five".