145452121 has 4 divisors (see below), whose sum is σ = 147836644. Its totient is φ = 143067600.

The previous prime is 145452113. The next prime is 145452137. The reversal of 145452121 is 121254541.

145452121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 36542025 + 108910096 = 6045^2 + 10436^2 .

It is a cyclic number.

It is not a de Polignac number, because 145452121 - 2³ = 145452113 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145452521) 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, 1192170 + ... + 1192291.

It is an arithmetic number, because the mean of its divisors is an integer number (36959161).

Almost surely, 2^145452121 is an apocalyptic number.

It is an amenable number.

145452121 is a deficient number, since it is larger than the sum of its proper divisors (2384523).

145452121 is an equidigital number, since it uses as much as digits as its factorization.

145452121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2384522.

The product of its digits is 1600, while the sum is 25.

The square root of 145452121 is about 12060.3532701161. The cubic root of 145452121 is about 525.9042568874.

The spelling of 145452121 in words is "one hundred forty-five million, four hundred fifty-two thousand, one hundred twenty-one".