1561525248 has 88 divisors (see below), whose sum is σ = 4173751120. Its totient is φ = 519045120.

The previous prime is 1561525247. The next prime is 1561525267. The reversal of 1561525248 is 8425251651.

It is a super-2 number, since 2×1561525248² = 4876722200282923008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561525243) 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 7 ways as a sum of consecutive naturals, for example, 2030208 + ... + 2030976.

It is an arithmetic number, because the mean of its divisors is an integer number (47428990).

Almost surely, 2^1561525248 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1561525248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2086875560).

1561525248 is an abundant number, since it is smaller than the sum of its proper divisors (2612225872).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1561525248 is an equidigital number, since it uses as much as digits as its factorization.

1561525248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1453 (or 1435 counting only the distinct ones).

The product of its digits is 96000, while the sum is 39.

The square root of 1561525248 is about 39516.1390826584. The cubic root of 1561525248 is about 1160.1558569813.

Adding to 1561525248 its reverse (8425251651), we get a palindrome (9986776899).

The spelling of 1561525248 in words is "one billion, five hundred sixty-one million, five hundred twenty-five thousand, two hundred forty-eight".