1655971 has 4 divisors (see below), whose sum is σ = 1668744. Its totient is φ = 1643200.

The previous prime is 1655963. The next prime is 1655981. The reversal of 1655971 is 1795561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1655971 - 2³ = 1655963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1655921) 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, 6190 + ... + 6451.

It is an arithmetic number, because the mean of its divisors is an integer number (417186).

2^1655971 is an apocalyptic number.

1655971 is a deficient number, since it is larger than the sum of its proper divisors (12773).

1655971 is a wasteful number, since it uses less digits than its factorization.

1655971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12772.

The product of its digits is 9450, while the sum is 34.

The square root of 1655971 is about 1286.8453675559. The cubic root of 1655971 is about 118.3089433742.

The spelling of 1655971 in words is "one million, six hundred fifty-five thousand, nine hundred seventy-one".