145531115 has 4 divisors (see below), whose sum is σ = 174637344. Its totient is φ = 116424888.

The previous prime is 145531079. The next prime is 145531123. The reversal of 145531115 is 511135541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 511135541 = 7 ⋅73019363.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145531115 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 14553107 + ... + 14553116.

It is an arithmetic number, because the mean of its divisors is an integer number (43659336).

Almost surely, 2^145531115 is an apocalyptic number.

145531115 is a deficient number, since it is larger than the sum of its proper divisors (29106229).

145531115 is an equidigital number, since it uses as much as digits as its factorization.

145531115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29106228.

The product of its digits is 1500, while the sum is 26.

The square root of 145531115 is about 12063.6277711143. The cubic root of 145531115 is about 525.9994445965. Note that the first 3 decimals are identical.

Adding to 145531115 its reverse (511135541), we get a palindrome (656666656).

The spelling of 145531115 in words is "one hundred forty-five million, five hundred thirty-one thousand, one hundred fifteen".