1561045542 has 16 divisors (see below), whose sum is σ = 3568104192. Its totient is φ = 446013000.

The previous prime is 1561045523. The next prime is 1561045543. The reversal of 1561045542 is 2455401651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561045543) 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, 18583834 + ... + 18583917.

It is an arithmetic number, because the mean of its divisors is an integer number (223006512).

Almost surely, 2^1561045542 is an apocalyptic number.

1561045542 is an abundant number, since it is smaller than the sum of its proper divisors (2007058650).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1561045542 is a wasteful number, since it uses less digits than its factorization.

1561045542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37167763.

The product of its (nonzero) digits is 24000, while the sum is 33.

The square root of 1561045542 is about 39510.0688685808. The cubic root of 1561045542 is about 1160.0370435059.

The spelling of 1561045542 in words is "one billion, five hundred sixty-one million, forty-five thousand, five hundred forty-two".