1561243004 has 12 divisors (see below), whose sum is σ = 2753689344. Its totient is φ = 774474624.

The previous prime is 1561243003. The next prime is 1561243007. The reversal of 1561243004 is 4003421651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561243003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1536149 + ... + 1537164.

It is an arithmetic number, because the mean of its divisors is an integer number (229474112).

Almost surely, 2^1561243004 is an apocalyptic number.

It is an amenable number.

1561243004 is a deficient number, since it is larger than the sum of its proper divisors (1192446340).

1561243004 is a wasteful number, since it uses less digits than its factorization.

1561243004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3073444 (or 3073442 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 1561243004 is about 39512.5676715650. The cubic root of 1561243004 is about 1160.0859537973.

Adding to 1561243004 its reverse (4003421651), we get a palindrome (5564664655).

The spelling of 1561243004 in words is "one billion, five hundred sixty-one million, two hundred forty-three thousand, four".