145429221 has 8 divisors (see below), whose sum is σ = 221606464. Its totient is φ = 83102400.

The previous prime is 145429189. The next prime is 145429223. The reversal of 145429221 is 122924541.

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

It is not a de Polignac number, because 145429221 - 2⁵ = 145429189 is a prime.

It is a super-2 number, since 2×145429221² = 42299316641333682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145429223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3462580 + ... + 3462621.

It is an arithmetic number, because the mean of its divisors is an integer number (27700808).

Almost surely, 2^145429221 is an apocalyptic number.

It is an amenable number.

145429221 is a deficient number, since it is larger than the sum of its proper divisors (76177243).

145429221 is an equidigital number, since it uses as much as digits as its factorization.

145429221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6925211.

The product of its digits is 5760, while the sum is 30.

The square root of 145429221 is about 12059.4038409865. The cubic root of 145429221 is about 525.8766559617.

The spelling of 145429221 in words is "one hundred forty-five million, four hundred twenty-nine thousand, two hundred twenty-one".