1561510042 has 16 divisors (see below), whose sum is σ = 2376934560. Its totient is φ = 769249872.

The previous prime is 1561510039. The next prime is 1561510081. The reversal of 1561510042 is 2400151651.

It is a happy number.

It is a super-2 number, since 2×1561510042² = 4876627222533683528, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1561509989 and 1561510016.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 49309 + ... + 74527.

It is an arithmetic number, because the mean of its divisors is an integer number (148558410).

Almost surely, 2^1561510042 is an apocalyptic number.

1561510042 is a deficient number, since it is larger than the sum of its proper divisors (815424518).

1561510042 is a wasteful number, since it uses less digits than its factorization.

1561510042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25677.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 1561510042 is about 39515.9466797899. The cubic root of 1561510042 is about 1160.1520911361.

Adding to 1561510042 its reverse (2400151651), we get a palindrome (3961661693).

The spelling of 1561510042 in words is "one billion, five hundred sixty-one million, five hundred ten thousand, forty-two".