1561824742 has 16 divisors (see below), whose sum is σ = 2370392640. Its totient is φ = 771717888.

The previous prime is 1561824673. The next prime is 1561824749. The reversal of 1561824742 is 2474281651.

It is a junction number, because it is equal to n+sod(n) for n = 1561824695 and 1561824704.

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, 133888 + ... + 145084.

It is an arithmetic number, because the mean of its divisors is an integer number (148149540).

Almost surely, 2^1561824742 is an apocalyptic number.

1561824742 is a deficient number, since it is larger than the sum of its proper divisors (808567898).

1561824742 is a wasteful number, since it uses less digits than its factorization.

1561824742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12015.

The product of its digits is 107520, while the sum is 40.

The square root of 1561824742 is about 39519.9284159271. The cubic root of 1561824742 is about 1160.2300232507.

The spelling of 1561824742 in words is "one billion, five hundred sixty-one million, eight hundred twenty-four thousand, seven hundred forty-two".