1561262325 has 24 divisors (see below), whose sum is σ = 2950043328. Its totient is φ = 713719680.

The previous prime is 1561262321. The next prime is 1561262327. The reversal of 1561262325 is 5232621651.

It is not a de Polignac number, because 1561262325 - 2² = 1561262321 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 (1561262321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1486392 + ... + 1487441.

It is an arithmetic number, because the mean of its divisors is an integer number (122918472).

Almost surely, 2^1561262325 is an apocalyptic number.

1561262325 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1561262325 is a deficient number, since it is larger than the sum of its proper divisors (1388781003).

1561262325 is a wasteful number, since it uses less digits than its factorization.

1561262325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2973853 (or 2973848 counting only the distinct ones).

The product of its digits is 21600, while the sum is 33.

The square root of 1561262325 is about 39512.8121626391. The cubic root of 1561262325 is about 1160.0907392851.

Adding to 1561262325 its reverse (5232621651), we get a palindrome (6793883976).

The spelling of 1561262325 in words is "one billion, five hundred sixty-one million, two hundred sixty-two thousand, three hundred twenty-five".