145550521 has 4 divisors (see below), whose sum is σ = 145598544. Its totient is φ = 145502500.

The previous prime is 145550519. The next prime is 145550527. The reversal of 145550521 is 125055541.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 145550521 - 2¹ = 145550519 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 145550521.

It is not an unprimeable number, because it can be changed into a prime (145550527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19135 + ... + 25636.

It is an arithmetic number, because the mean of its divisors is an integer number (36399636).

Almost surely, 2^145550521 is an apocalyptic number.

It is an amenable number.

145550521 is a deficient number, since it is larger than the sum of its proper divisors (48023).

145550521 is an equidigital number, since it uses as much as digits as its factorization.

145550521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48022.

The product of its (nonzero) digits is 5000, while the sum is 28.

The square root of 145550521 is about 12064.4320628863. The cubic root of 145550521 is about 526.0228235409.

The spelling of 145550521 in words is "one hundred forty-five million, five hundred fifty thousand, five hundred twenty-one".