1655121 has 24 divisors (see below), whose sum is σ = 2521344. Its totient is φ = 959040.

The previous prime is 1655099. The next prime is 1655123. The reversal of 1655121 is 1215561.

It is not a de Polignac number, because 1655121 - 2⁵ = 1655089 is a prime.

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

1655121 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1655123) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44715 + ... + 44751.

It is an arithmetic number, because the mean of its divisors is an integer number (105056).

2^1655121 is an apocalyptic number.

It is an amenable number.

1655121 is a deficient number, since it is larger than the sum of its proper divisors (866223).

1655121 is a wasteful number, since it uses less digits than its factorization.

1655121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121 (or 84 counting only the distinct ones).

The product of its digits is 300, while the sum is 21.

The square root of 1655121 is about 1286.5150601528. The cubic root of 1655121 is about 118.2886974856.

The spelling of 1655121 in words is "one million, six hundred fifty-five thousand, one hundred twenty-one".