145015521 has 16 divisors (see below), whose sum is σ = 221260800. Its totient is φ = 82759248.

The previous prime is 145015517. The next prime is 145015531. The reversal of 145015521 is 125510541.

It is not a de Polignac number, because 145015521 - 2² = 145015517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 145015491 and 145015500.

It is not an unprimeable number, because it can be changed into a prime (145015511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14020 + ... + 22058.

It is an arithmetic number, because the mean of its divisors is an integer number (13828800).

Almost surely, 2^145015521 is an apocalyptic number.

It is an amenable number.

145015521 is a deficient number, since it is larger than the sum of its proper divisors (76245279).

145015521 is an equidigital number, since it uses as much as digits as its factorization.

145015521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8908.

The product of its (nonzero) digits is 1000, while the sum is 24.

The square root of 145015521 is about 12042.2390359933. The cubic root of 145015521 is about 525.3775316236.

The spelling of 145015521 in words is "one hundred forty-five million, fifteen thousand, five hundred twenty-one".