145158521 has 2 divisors, whose sum is σ = 145158522. Its totient is φ = 145158520.

The previous prime is 145158493. The next prime is 145158527. The reversal of 145158521 is 125851541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124099600 + 21058921 = 11140^2 + 4589^2 .

It is a cyclic number.

It is not a de Polignac number, because 145158521 - 2¹⁰ = 145157497 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 (145158527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72579260 + 72579261.

It is an arithmetic number, because the mean of its divisors is an integer number (72579261).

Almost surely, 2^145158521 is an apocalyptic number.

It is an amenable number.

145158521 is a deficient number, since it is larger than the sum of its proper divisors (1).

145158521 is an equidigital number, since it uses as much as digits as its factorization.

145158521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8000, while the sum is 32.

The square root of 145158521 is about 12048.1750070291. The cubic root of 145158521 is about 525.5501667206.

The spelling of 145158521 in words is "one hundred forty-five million, one hundred fifty-eight thousand, five hundred twenty-one".