145502121 has 16 divisors (see below), whose sum is σ = 197538560. Its totient is φ = 95247360.

The previous prime is 145502111. The next prime is 145502143. The reversal of 145502121 is 121205541.

145502121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 145502121 - 2⁵ = 145502089 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (145502111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44151 + ... + 47331.

It is an arithmetic number, because the mean of its divisors is an integer number (12346160).

Almost surely, 2^145502121 is an apocalyptic number.

It is an amenable number.

145502121 is a deficient number, since it is larger than the sum of its proper divisors (52036439).

145502121 is a wasteful number, since it uses less digits than its factorization.

145502121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3456.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 145502121 is about 12062.4259997730. The cubic root of 145502121 is about 525.9645108509.

Adding to 145502121 its reverse (121205541), we get a palindrome (266707662).

The spelling of 145502121 in words is "one hundred forty-five million, five hundred two thousand, one hundred twenty-one".