145215055 has 4 divisors (see below), whose sum is σ = 174258072. Its totient is φ = 116172040.

The previous prime is 145215019. The next prime is 145215089. The reversal of 145215055 is 550512541.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 145215055 - 2⁹ = 145214543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14521501 + ... + 14521510.

It is an arithmetic number, because the mean of its divisors is an integer number (43564518).

Almost surely, 2^145215055 is an apocalyptic number.

145215055 is a deficient number, since it is larger than the sum of its proper divisors (29043017).

145215055 is an equidigital number, since it uses as much as digits as its factorization.

145215055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29043016.

The product of its (nonzero) digits is 5000, while the sum is 28.

The square root of 145215055 is about 12050.5209430962. The cubic root of 145215055 is about 525.6183854665.

Adding to 145215055 its reverse (550512541), we get a palindrome (695727596).

The spelling of 145215055 in words is "one hundred forty-five million, two hundred fifteen thousand, fifty-five".