1556081 has 4 divisors (see below), whose sum is σ = 1638000. Its totient is φ = 1474164.

The previous prime is 1556069. The next prime is 1556083. The reversal of 1556081 is 1806551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1556081 - 2⁶ = 1556017 is a prime.

It is a super-2 number, since 2×1556081² = 4842776157122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1556081.

It is not an unprimeable number, because it can be changed into a prime (1556083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40931 + ... + 40968.

It is an arithmetic number, because the mean of its divisors is an integer number (409500).

2^1556081 is an apocalyptic number.

It is an amenable number.

1556081 is a deficient number, since it is larger than the sum of its proper divisors (81919).

1556081 is an equidigital number, since it uses as much as digits as its factorization.

1556081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81918.

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 1556081 is about 1247.4297575415. The cubic root of 1556081 is about 115.8805994958.

The spelling of 1556081 in words is "one million, five hundred fifty-six thousand, eighty-one".