1561530 has 16 divisors (see below), whose sum is σ = 3747744. Its totient is φ = 416400.

The previous prime is 1561529. The next prime is 1561537. The reversal of 1561530 is 351651.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1561497 and 1561506.

It is not an unprimeable number, because it can be changed into a prime (1561537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25996 + ... + 26055.

It is an arithmetic number, because the mean of its divisors is an integer number (234234).

2^1561530 is an apocalyptic number.

1561530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1561530 is an abundant number, since it is smaller than the sum of its proper divisors (2186214).

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

1561530 is a wasteful number, since it uses less digits than its factorization.

1561530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52061.

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 1561530 is about 1249.6119397637. The cubic root of 1561530 is about 116.0157033834.

The spelling of 1561530 in words is "one million, five hundred sixty-one thousand, five hundred thirty".