1561451442 has 8 divisors (see below), whose sum is σ = 3122902896. Its totient is φ = 520483812.

The previous prime is 1561451417. The next prime is 1561451447. The reversal of 1561451442 is 2441541651.

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

1561451442 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (1561451447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130120948 + ... + 130120959.

It is an arithmetic number, because the mean of its divisors is an integer number (390362862).

Almost surely, 2^1561451442 is an apocalyptic number.

1561451442 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1561451442 is a wasteful number, since it uses less digits than its factorization.

1561451442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260241912.

The product of its digits is 19200, while the sum is 33.

The square root of 1561451442 is about 39515.2052000240. The cubic root of 1561451442 is about 1160.1375783117.

The spelling of 1561451442 in words is "one billion, five hundred sixty-one million, four hundred fifty-one thousand, four hundred forty-two".