145221789 has 8 divisors (see below), whose sum is σ = 193832352. Its totient is φ = 96712880.

The previous prime is 145221787. The next prime is 145221799. The reversal of 145221789 is 987122541.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 145221789 - 2¹ = 145221787 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145221787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22014 + ... + 27839.

It is an arithmetic number, because the mean of its divisors is an integer number (24229044).

Almost surely, 2^145221789 is an apocalyptic number.

It is an amenable number.

145221789 is a deficient number, since it is larger than the sum of its proper divisors (48610563).

145221789 is an equidigital number, since it uses as much as digits as its factorization.

145221789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50827.

The product of its digits is 40320, while the sum is 39.

The square root of 145221789 is about 12050.8003468649. The cubic root of 145221789 is about 525.6265101050.

The spelling of 145221789 in words is "one hundred forty-five million, two hundred twenty-one thousand, seven hundred eighty-nine".