1556361 has 16 divisors (see below), whose sum is σ = 2347200. Its totient is φ = 1018944.

The previous prime is 1556351. The next prime is 1556363. The reversal of 1556361 is 1636551.

It is a happy number.

It is not a de Polignac number, because 1556361 - 2⁵ = 1556329 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (1556363) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1105 + ... + 2081.

It is an arithmetic number, because the mean of its divisors is an integer number (146700).

2^1556361 is an apocalyptic number.

It is an amenable number.

1556361 is a deficient number, since it is larger than the sum of its proper divisors (790839).

1556361 is an equidigital number, since it uses as much as digits as its factorization.

1556361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1045 (or 1039 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

The square root of 1556361 is about 1247.5419832615. The cubic root of 1556361 is about 115.8875495672.

The spelling of 1556361 in words is "one million, five hundred fifty-six thousand, three hundred sixty-one".