1561330 has 16 divisors (see below), whose sum is σ = 2876544. Its totient is φ = 609840.

The previous prime is 1561303. The next prime is 1561337. The reversal of 1561330 is 331651.

It is a junction number, because it is equal to n+sod(n) for n = 1561298 and 1561307.

It is not an unprimeable number, because it can be changed into a prime (1561337) 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, 1386 + ... + 2245.

It is an arithmetic number, because the mean of its divisors is an integer number (179784).

2^1561330 is an apocalyptic number.

1561330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1561330 is a deficient number, since it is larger than the sum of its proper divisors (1315214).

1561330 is a wasteful number, since it uses less digits than its factorization.

1561330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3681.

The product of its (nonzero) digits is 270, while the sum is 19.

The square root of 1561330 is about 1249.5319123576. The cubic root of 1561330 is about 116.0107500937.

Adding to 1561330 its reverse (331651), we get a palindrome (1892981).

It can be divided in two parts, 1561 and 330, that added together give a triangular number (1891 = T₆₁).

The spelling of 1561330 in words is "one million, five hundred sixty-one thousand, three hundred thirty".