145221508 has 12 divisors (see below), whose sum is σ = 260336412. Its totient is φ = 70839680.

The previous prime is 145221481. The next prime is 145221547. The reversal of 145221508 is 805122541.

145221508 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 87946884 + 57274624 = 9378^2 + 7568^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 442585 + ... + 442912.

It is an arithmetic number, because the mean of its divisors is an integer number (21694701).

Almost surely, 2^145221508 is an apocalyptic number.

It is an amenable number.

145221508 is a deficient number, since it is larger than the sum of its proper divisors (115114904).

145221508 is a wasteful number, since it uses less digits than its factorization.

145221508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885542 (or 885540 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 145221508 is about 12050.7886878826. The cubic root of 145221508 is about 525.6261710807.

The spelling of 145221508 in words is "one hundred forty-five million, two hundred twenty-one thousand, five hundred eight".