1361521645 has 48 divisors (see below), whose sum is σ = 1858127040. Its totient is φ = 956384000.

The previous prime is 1361521633. The next prime is 1361521691. The reversal of 1361521645 is 5461251631.

It is not a de Polignac number, because 1361521645 - 2¹³ = 1361513453 is a prime.

It is a super-3 number, since 3×1361521645³ (a number of 28 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1361521645.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3249246 + ... + 3249664.

It is an arithmetic number, because the mean of its divisors is an integer number (38710980).

Almost surely, 2^1361521645 is an apocalyptic number.

It is an amenable number.

1361521645 is a deficient number, since it is larger than the sum of its proper divisors (496605395).

1361521645 is a wasteful number, since it uses less digits than its factorization.

1361521645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618 (or 607 counting only the distinct ones).

The product of its digits is 21600, while the sum is 34.

The square root of 1361521645 is about 36898.8027583552. The cubic root of 1361521645 is about 1108.3447028940.

The spelling of 1361521645 in words is "one billion, three hundred sixty-one million, five hundred twenty-one thousand, six hundred forty-five".