1656331 has 4 divisors (see below), whose sum is σ = 1665664. Its totient is φ = 1647000.

The previous prime is 1656323. The next prime is 1656367. The reversal of 1656331 is 1336561.

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 1656331 - 2³ = 1656323 is a prime.

It is a super-2 number, since 2×1656331² = 5486864763122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1656296 and 1656305.

It is not an unprimeable number, because it can be changed into a prime (1656301) 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, 4395 + ... + 4756.

It is an arithmetic number, because the mean of its divisors is an integer number (416416).

2^1656331 is an apocalyptic number.

1656331 is a deficient number, since it is larger than the sum of its proper divisors (9333).

1656331 is an equidigital number, since it uses as much as digits as its factorization.

1656331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9332.

The product of its digits is 1620, while the sum is 25.

The square root of 1656331 is about 1286.9852369006. The cubic root of 1656331 is about 118.3175160150.

The spelling of 1656331 in words is "one million, six hundred fifty-six thousand, three hundred thirty-one".