1561626 has 48 divisors (see below), whose sum is σ = 3830400. Its totient is φ = 471240.

The previous prime is 1561607. The next prime is 1561633. The reversal of 1561626 is 6261651.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nialpdrome in base 11.

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 1561626.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6415 + ... + 6653.

It is an arithmetic number, because the mean of its divisors is an integer number (79800).

2^1561626 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1561626, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1915200).

1561626 is an abundant number, since it is smaller than the sum of its proper divisors (2268774).

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

1561626 is a wasteful number, since it uses less digits than its factorization.

1561626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272 (or 255 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 1561626 is about 1249.6503510983. The cubic root of 1561626 is about 116.0180808122.

It can be divided in two parts, 1561 and 626, that added together give a 7-th power (2187 = 3⁷).

The spelling of 1561626 in words is "one million, five hundred sixty-one thousand, six hundred twenty-six".