1561544 has 8 divisors (see below), whose sum is σ = 2927910. Its totient is φ = 780768.

The previous prime is 1561541. The next prime is 1561559. The reversal of 1561544 is 4451651.

It can be written as a sum of positive squares in only one way, i.e., 1532644 + 28900 = 1238^2 + 170^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (1561541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97589 + ... + 97604.

2^1561544 is an apocalyptic number.

It is an amenable number.

1561544 is a deficient number, since it is larger than the sum of its proper divisors (1366366).

1561544 is a wasteful number, since it uses less digits than its factorization.

1561544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195199 (or 195195 counting only the distinct ones).

The product of its digits is 2400, while the sum is 26.

The square root of 1561544 is about 1249.6175414902. The cubic root of 1561544 is about 116.0160500978.

The spelling of 1561544 in words is "one million, five hundred sixty-one thousand, five hundred forty-four".