145221552 has 80 divisors (see below), whose sum is σ = 476398080. Its totient is φ = 41491008.

The previous prime is 145221547. The next prime is 145221581. The reversal of 145221552 is 255122541.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20988 + ... + 27035.

It is an arithmetic number, because the mean of its divisors is an integer number (5954976).

Almost surely, 2^145221552 is an apocalyptic number.

145221552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

145221552 is an abundant number, since it is smaller than the sum of its proper divisors (331176528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

145221552 is a wasteful number, since it uses less digits than its factorization.

145221552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48047 (or 48035 counting only the distinct ones).

The product of its digits is 4000, while the sum is 27.

The square root of 145221552 is about 12050.7905134891. The cubic root of 145221552 is about 525.6262241664.

The spelling of 145221552 in words is "one hundred forty-five million, two hundred twenty-one thousand, five hundred fifty-two".