1561237005 has 8 divisors (see below), whose sum is σ = 2497979232. Its totient is φ = 832659728.

The previous prime is 1561236977. The next prime is 1561237009. The reversal of 1561237005 is 5007321651.

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

It is a cyclic number.

It is not a de Polignac number, because 1561237005 - 2⁷ = 1561236877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561237009) 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, 52041219 + ... + 52041248.

It is an arithmetic number, because the mean of its divisors is an integer number (312247404).

Almost surely, 2^1561237005 is an apocalyptic number.

1561237005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1561237005 is a deficient number, since it is larger than the sum of its proper divisors (936742227).

1561237005 is a wasteful number, since it uses less digits than its factorization.

1561237005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104082475.

The product of its (nonzero) digits is 6300, while the sum is 30.

The square root of 1561237005 is about 39512.4917589362. The cubic root of 1561237005 is about 1160.0844679375.

Adding to 1561237005 its reverse (5007321651), we get a palindrome (6568558656).

The spelling of 1561237005 in words is "one billion, five hundred sixty-one million, two hundred thirty-seven thousand, five".