145532521 has 2 divisors, whose sum is σ = 145532522. Its totient is φ = 145532520.

The previous prime is 145532489. The next prime is 145532537. The reversal of 145532521 is 125235541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137804121 + 7728400 = 11739^2 + 2780^2 .

It is a cyclic number.

It is not a de Polignac number, because 145532521 - 2⁵ = 145532489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 145532521.

It is not a weakly prime, because it can be changed into another prime (145532551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72766260 + 72766261.

It is an arithmetic number, because the mean of its divisors is an integer number (72766261).

Almost surely, 2^145532521 is an apocalyptic number.

It is an amenable number.

145532521 is a deficient number, since it is larger than the sum of its proper divisors (1).

145532521 is an equidigital number, since it uses as much as digits as its factorization.

145532521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6000, while the sum is 28.

The square root of 145532521 is about 12063.6860453180. The cubic root of 145532521 is about 526.0011385133.

The spelling of 145532521 in words is "one hundred forty-five million, five hundred thirty-two thousand, five hundred twenty-one".