145242521 has 4 divisors (see below), whose sum is σ = 146204544. Its totient is φ = 144280500.

The previous prime is 145242511. The next prime is 145242551. The reversal of 145242521 is 125242541.

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 de Polignac number, because none of the positive numbers 2^k-145242521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145242511) 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, 480785 + ... + 481086.

It is an arithmetic number, because the mean of its divisors is an integer number (36551136).

Almost surely, 2^145242521 is an apocalyptic number.

It is an amenable number.

145242521 is a deficient number, since it is larger than the sum of its proper divisors (962023).

145242521 is an equidigital number, since it uses as much as digits as its factorization.

145242521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 962022.

The product of its digits is 3200, while the sum is 26.

The square root of 145242521 is about 12051.6605079964. The cubic root of 145242521 is about 525.6515218941.

The spelling of 145242521 in words is "one hundred forty-five million, two hundred forty-two thousand, five hundred twenty-one".