145221505 has 32 divisors (see below), whose sum is σ = 205970688. Its totient is φ = 96902400.

The previous prime is 145221481. The next prime is 145221547. The reversal of 145221505 is 505122541.

145221505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 145221505 - 2¹⁷ = 145090433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 145221505.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 140340 + ... + 141370.

It is an arithmetic number, because the mean of its divisors is an integer number (6436584).

Almost surely, 2^145221505 is an apocalyptic number.

It is an amenable number.

145221505 is a deficient number, since it is larger than the sum of its proper divisors (60749183).

145221505 is a wasteful number, since it uses less digits than its factorization.

145221505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1257.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 145221505 is about 12050.7885634095. The cubic root of 145221505 is about 525.6261674613.

The spelling of 145221505 in words is "one hundred forty-five million, two hundred twenty-one thousand, five hundred five".