145220999 has 16 divisors (see below), whose sum is σ = 181336320. Its totient is φ = 112983360.

The previous prime is 145220989. The next prime is 145221001. The reversal of 145220999 is 999022541.

It is a happy number.

It is not a de Polignac number, because 145220999 - 2²⁰ = 144172423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145220969) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72392 + ... + 74370.

It is an arithmetic number, because the mean of its divisors is an integer number (11333520).

Almost surely, 2^145220999 is an apocalyptic number.

145220999 is a deficient number, since it is larger than the sum of its proper divisors (36115321).

145220999 is a wasteful number, since it uses less digits than its factorization.

145220999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2950.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 145220999 is about 12050.7675689144. The cubic root of 145220999 is about 525.6255569751.

The spelling of 145220999 in words is "one hundred forty-five million, two hundred twenty thousand, nine hundred ninety-nine".