1561834742 has 16 divisors (see below), whose sum is σ = 2531586960. Its totient is φ = 718383072.

The previous prime is 1561834741. The next prime is 1561834801. The reversal of 1561834742 is 2474381651.

It is a super-2 number, since 2×1561834742² = 4878655522636413128, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1561834742.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561834741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94892 + ... + 110127.

It is an arithmetic number, because the mean of its divisors is an integer number (158224185).

Almost surely, 2^1561834742 is an apocalyptic number.

1561834742 is a deficient number, since it is larger than the sum of its proper divisors (969752218).

1561834742 is a wasteful number, since it uses less digits than its factorization.

1561834742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205327.

The product of its digits is 161280, while the sum is 41.

The square root of 1561834742 is about 39520.0549341723. The cubic root of 1561834742 is about 1160.2324994730.

The spelling of 1561834742 in words is "one billion, five hundred sixty-one million, eight hundred thirty-four thousand, seven hundred forty-two".