1561552 has 20 divisors (see below), whose sum is σ = 3204036. Its totient is φ = 734720.

The previous prime is 1561541. The next prime is 1561559. The reversal of 1561552 is 2551651.

It can be written as a sum of positive squares in 2 ways, for example, as 1008016 + 553536 = 1004^2 + 744^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561559) 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, 2599 + ... + 3142.

2^1561552 is an apocalyptic number.

It is an amenable number.

1561552 is an abundant number, since it is smaller than the sum of its proper divisors (1642484).

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

1561552 is a wasteful number, since it uses less digits than its factorization.

1561552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5766 (or 5760 counting only the distinct ones).

The product of its digits is 1500, while the sum is 25.

The square root of 1561552 is about 1249.6207424655. The cubic root of 1561552 is about 116.0162482194.

Subtracting 1561552 from its reverse (2551651), we obtain a palindrome (990099).

The spelling of 1561552 in words is "one million, five hundred sixty-one thousand, five hundred fifty-two".