1561363125 has 80 divisors (see below), whose sum is σ = 2990342784. Its totient is φ = 709632000.

The previous prime is 1561363123. The next prime is 1561363127. The reversal of 1561363125 is 5213631651.

It is an interprime number because it is at equal distance from previous prime (1561363123) and next prime (1561363127).

It is not a de Polignac number, because 1561363125 - 2¹ = 1561363123 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561363123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 4422949 + ... + 4423301.

Almost surely, 2^1561363125 is an apocalyptic number.

1561363125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1561363125 is a deficient number, since it is larger than the sum of its proper divisors (1428979659).

1561363125 is an equidigital number, since it uses as much as digits as its factorization.

1561363125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720 (or 705 counting only the distinct ones).

The product of its digits is 16200, while the sum is 33.

The square root of 1561363125 is about 39514.0876776878. The cubic root of 1561363125 is about 1160.1157051153.

Adding to 1561363125 its reverse (5213631651), we get a palindrome (6774994776).

The spelling of 1561363125 in words is "one billion, five hundred sixty-one million, three hundred sixty-three thousand, one hundred twenty-five".