145217554 has 8 divisors (see below), whose sum is σ = 218655360. Its totient is φ = 72332436.

The previous prime is 145217549. The next prime is 145217557. The reversal of 145217554 is 455712541.

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

It is not an unprimeable number, because it can be changed into a prime (145217557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137514 + ... + 138565.

It is an arithmetic number, because the mean of its divisors is an integer number (27331920).

Almost surely, 2^145217554 is an apocalyptic number.

145217554 is a deficient number, since it is larger than the sum of its proper divisors (73437806).

145217554 is a wasteful number, since it uses less digits than its factorization.

145217554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276344.

The product of its digits is 28000, while the sum is 34.

The square root of 145217554 is about 12050.6246311135. The cubic root of 145217554 is about 525.6214005644.

The spelling of 145217554 in words is "one hundred forty-five million, two hundred seventeen thousand, five hundred fifty-four".