145315121 has 4 divisors (see below), whose sum is σ = 166074432. Its totient is φ = 124555812.

The previous prime is 145315087. The next prime is 145315141. The reversal of 145315121 is 121513541.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 145315121 - 2⁶ = 145315057 is a prime.

It is a super-2 number, since 2×145315121² = 42232968782489282, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (145315141) 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, 10379645 + ... + 10379658.

It is an arithmetic number, because the mean of its divisors is an integer number (41518608).

Almost surely, 2^145315121 is an apocalyptic number.

It is an amenable number.

145315121 is a deficient number, since it is larger than the sum of its proper divisors (20759311).

145315121 is an equidigital number, since it uses as much as digits as its factorization.

145315121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20759310.

The product of its digits is 600, while the sum is 23.

The square root of 145315121 is about 12054.6721647667. The cubic root of 145315121 is about 525.7390902441.

Adding to 145315121 its reverse (121513541), we get a palindrome (266828662).

It can be divided in two parts, 14 and 5315121, that added together give a palindrome (5315135).

The spelling of 145315121 in words is "one hundred forty-five million, three hundred fifteen thousand, one hundred twenty-one".