145515541 has 4 divisors (see below), whose sum is σ = 145746784. Its totient is φ = 145284300.

The previous prime is 145515497. The next prime is 145515553.

145515541 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 145515541 - 2¹⁵ = 145482773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145515571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114675 + ... + 115936.

It is an arithmetic number, because the mean of its divisors is an integer number (36436696).

Almost surely, 2^145515541 is an apocalyptic number.

It is an amenable number.

145515541 is a deficient number, since it is larger than the sum of its proper divisors (231243).

145515541 is an equidigital number, since it uses as much as digits as its factorization.

145515541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231242.

The product of its digits is 10000, while the sum is 31.

The square root of 145515541 is about 12062.9822597897. The cubic root of 145515541 is about 525.9806806650.

Adding to 145515541 its product of digits (10000), we get a palindrome (145525541).

Subtracting from 145515541 its product of digits (10000), we obtain a palindrome (145505541).

The spelling of 145515541 in words is "one hundred forty-five million, five hundred fifteen thousand, five hundred forty-one".