1656961 has 4 divisors (see below), whose sum is σ = 1673152. Its totient is φ = 1640772.

The previous prime is 1656953. The next prime is 1656979. The reversal of 1656961 is 1696561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1696561 = 37 ⋅45853.

It is a cyclic number.

It is not a de Polignac number, because 1656961 - 2³ = 1656953 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1656901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7941 + ... + 8146.

It is an arithmetic number, because the mean of its divisors is an integer number (418288).

2^1656961 is an apocalyptic number.

It is an amenable number.

1656961 is a deficient number, since it is larger than the sum of its proper divisors (16191).

1656961 is a wasteful number, since it uses less digits than its factorization.

1656961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16190.

The product of its digits is 9720, while the sum is 34.

The square root of 1656961 is about 1287.2299716834. The cubic root of 1656961 is about 118.3325151479.

Adding to 1656961 its product of digits (9720), we get a square (1666681 = 1291²).

The spelling of 1656961 in words is "one million, six hundred fifty-six thousand, nine hundred sixty-one".