145819521 has 20 divisors (see below), whose sum is σ = 222469632. Its totient is φ = 95142168.

The previous prime is 145819519. The next prime is 145819549. The reversal of 145819521 is 125918541.

It is not a de Polignac number, because 145819521 - 2¹ = 145819519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (145812521) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 15345 + ... + 22958.

Almost surely, 2^145819521 is an apocalyptic number.

It is an amenable number.

145819521 is a deficient number, since it is larger than the sum of its proper divisors (76650111).

145819521 is an equidigital number, since it uses as much as digits as its factorization.

145819521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38362 (or 38353 counting only the distinct ones).

The product of its digits is 14400, while the sum is 36.

The square root of 145819521 is about 12075.5753900177. The cubic root of 145819521 is about 526.3466814392.

The spelling of 145819521 in words is "one hundred forty-five million, eight hundred nineteen thousand, five hundred twenty-one".