145543121 has 8 divisors (see below), whose sum is σ = 147441000. Its totient is φ = 143654400.

The previous prime is 145543117. The next prime is 145543127. The reversal of 145543121 is 121345541.

It can be written as a sum of positive squares in 4 ways, for example, as 79852096 + 65691025 = 8936^2 + 8105^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 145543121 - 2² = 145543117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145543127) 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, 33185 + ... + 37313.

It is an arithmetic number, because the mean of its divisors is an integer number (18430125).

Almost surely, 2^145543121 is an apocalyptic number.

It is an amenable number.

145543121 is a deficient number, since it is larger than the sum of its proper divisors (1897879).

145543121 is a wasteful number, since it uses less digits than its factorization.

145543121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4579.

The product of its digits is 2400, while the sum is 26.

The square root of 145543121 is about 12064.1253723592. The cubic root of 145543121 is about 526.0139088015.

Adding to 145543121 its reverse (121345541), we get a palindrome (266888662).

The spelling of 145543121 in words is "one hundred forty-five million, five hundred forty-three thousand, one hundred twenty-one".