1561022542 has 8 divisors (see below), whose sum is σ = 2358379800. Its totient is φ = 774895944.

The previous prime is 1561022537. The next prime is 1561022587. The reversal of 1561022542 is 2452201651.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1561022542.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2807317 + ... + 2807872.

It is an arithmetic number, because the mean of its divisors is an integer number (294797475).

Almost surely, 2^1561022542 is an apocalyptic number.

1561022542 is a deficient number, since it is larger than the sum of its proper divisors (797357258).

1561022542 is a wasteful number, since it uses less digits than its factorization.

1561022542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5615330.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 1561022542 is about 39509.7778024630. Note that the first 3 decimals coincide. The cubic root of 1561022542 is about 1160.0313462596.

The spelling of 1561022542 in words is "one billion, five hundred sixty-one million, twenty-two thousand, five hundred forty-two".