1645525441 has 4 divisors (see below), whose sum is σ = 1880600512. Its totient is φ = 1410450372.

The previous prime is 1645525439. The next prime is 1645525451. The reversal of 1645525441 is 1445255461.

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 1645525441 - 2¹ = 1645525439 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1645525441.

It is not an unprimeable number, because it can be changed into a prime (1645525451) 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 3 ways as a sum of consecutive naturals, for example, 117537525 + ... + 117537538.

It is an arithmetic number, because the mean of its divisors is an integer number (470150128).

Almost surely, 2^1645525441 is an apocalyptic number.

It is an amenable number.

1645525441 is a deficient number, since it is larger than the sum of its proper divisors (235075071).

1645525441 is an equidigital number, since it uses as much as digits as its factorization.

1645525441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235075070.

The product of its digits is 96000, while the sum is 37.

The square root of 1645525441 is about 40565.0766177016. The cubic root of 1645525441 is about 1180.5966151312.

The spelling of 1645525441 in words is "one billion, six hundred forty-five million, five hundred twenty-five thousand, four hundred forty-one".