145531215 has 16 divisors (see below), whose sum is σ = 258722400. Its totient is φ = 77616576.

The previous prime is 145531157. The next prime is 145531219. The reversal of 145531215 is 512135541.

It is not a de Polignac number, because 145531215 - 2⁶ = 145531151 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145531219) 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 15 ways as a sum of consecutive naturals, for example, 538870 + ... + 539139.

It is an arithmetic number, because the mean of its divisors is an integer number (16170150).

Almost surely, 2^145531215 is an apocalyptic number.

145531215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

145531215 is a deficient number, since it is larger than the sum of its proper divisors (113191185).

145531215 is a wasteful number, since it uses less digits than its factorization.

145531215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1078023 (or 1078017 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 145531215 is about 12063.6319158038. The cubic root of 145531215 is about 525.9995650746. Note that the first 3 decimals are identical.

Adding to 145531215 its reverse (512135541), we get a palindrome (657666756).

The spelling of 145531215 in words is "one hundred forty-five million, five hundred thirty-one thousand, two hundred fifteen".