121632145 has 4 divisors (see below), whose sum is σ = 145958580. Its totient is φ = 97305712.

The previous prime is 121632103. The next prime is 121632149. The reversal of 121632145 is 541236121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17918289 + 103713856 = 4233^2 + 10184^2 .

It is a cyclic number.

It is not a de Polignac number, because 121632145 - 2⁹ = 121631633 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (121632149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12163210 + ... + 12163219.

It is an arithmetic number, because the mean of its divisors is an integer number (36489645).

Almost surely, 2^121632145 is an apocalyptic number.

It is an amenable number.

121632145 is a deficient number, since it is larger than the sum of its proper divisors (24326435).

121632145 is an equidigital number, since it uses as much as digits as its factorization.

121632145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24326434.

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

The square root of 121632145 is about 11028.6964324892. The cubic root of 121632145 is about 495.4685832538.

Adding to 121632145 its reverse (541236121), we get a palindrome (662868266).

The spelling of 121632145 in words is "one hundred twenty-one million, six hundred thirty-two thousand, one hundred forty-five".