1555881 has 8 divisors (see below), whose sum is σ = 2164800. Its totient is φ = 992112.

The previous prime is 1555861. The next prime is 1555901. The reversal of 1555881 is 1885551.

It is an interprime number because it is at equal distance from previous prime (1555861) and next prime (1555901).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1555881 - 2⁶ = 1555817 is a prime.

It is a super-2 number, since 2×1555881² = 4841531372322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1555831) 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, 11206 + ... + 11343.

It is an arithmetic number, because the mean of its divisors is an integer number (270600).

2^1555881 is an apocalyptic number.

It is an amenable number.

1555881 is a deficient number, since it is larger than the sum of its proper divisors (608919).

1555881 is a wasteful number, since it uses less digits than its factorization.

1555881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22575.

The product of its digits is 8000, while the sum is 33.

The square root of 1555881 is about 1247.3495901310. The cubic root of 1555881 is about 115.8756346487.

The spelling of 1555881 in words is "one million, five hundred fifty-five thousand, eight hundred eighty-one".