145440521 has 2 divisors, whose sum is σ = 145440522. Its totient is φ = 145440520.

The previous prime is 145440511. The next prime is 145440557. The reversal of 145440521 is 125044541.

145440521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135606025 + 9834496 = 11645^2 + 3136^2 .

It is a cyclic number.

It is not a de Polignac number, because 145440521 - 2¹⁸ = 145178377 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (145440511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72720260 + 72720261.

It is an arithmetic number, because the mean of its divisors is an integer number (72720261).

Almost surely, 2^145440521 is an apocalyptic number.

It is an amenable number.

145440521 is a deficient number, since it is larger than the sum of its proper divisors (1).

145440521 is an equidigital number, since it uses as much as digits as its factorization.

145440521 is an evil number, because the sum of its binary digits is even.

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

The square root of 145440521 is about 12059.8723459247. The cubic root of 145440521 is about 525.8902759946.

The spelling of 145440521 in words is "one hundred forty-five million, four hundred forty thousand, five hundred twenty-one".