1561824741 has 8 divisors (see below), whose sum is σ = 2102651200. Its totient is φ = 1031107392.

The previous prime is 1561824673. The next prime is 1561824749. The reversal of 1561824741 is 1474281651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1561824741 - 2¹¹ = 1561822693 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1561824741.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561824749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2526916 + ... + 2527533.

It is an arithmetic number, because the mean of its divisors is an integer number (262831400).

Almost surely, 2^1561824741 is an apocalyptic number.

It is an amenable number.

1561824741 is a deficient number, since it is larger than the sum of its proper divisors (540826459).

1561824741 is a wasteful number, since it uses less digits than its factorization.

1561824741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5054555.

The product of its digits is 53760, while the sum is 39.

The square root of 1561824741 is about 39519.9284032752. The cubic root of 1561824741 is about 1160.2300230031.

The spelling of 1561824741 in words is "one billion, five hundred sixty-one million, eight hundred twenty-four thousand, seven hundred forty-one".