1551655 has 16 divisors (see below), whose sum is σ = 2179584. Its totient is φ = 1038240.

The previous prime is 1551647. The next prime is 1551659. The reversal of 1551655 is 5561551.

It is not a de Polignac number, because 1551655 - 2³ = 1551647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551659) 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 15 ways as a sum of consecutive naturals, for example, 990 + ... + 2020.

It is an arithmetic number, because the mean of its divisors is an integer number (136224).

2^1551655 is an apocalyptic number.

1551655 is a deficient number, since it is larger than the sum of its proper divisors (627929).

1551655 is a wasteful number, since it uses less digits than its factorization.

1551655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1086.

The product of its digits is 3750, while the sum is 28.

The square root of 1551655 is about 1245.6544464658. The cubic root of 1551655 is about 115.7706278049.

The spelling of 1551655 in words is "one million, five hundred fifty-one thousand, six hundred fifty-five".