1656901 has 2 divisors, whose sum is σ = 1656902. Its totient is φ = 1656900.

The previous prime is 1656899. The next prime is 1656911. The reversal of 1656901 is 1096561.

It is the 526-th star number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 893025 + 763876 = 945^2 + 874^2 .

It is an emirp because it is prime and its reverse (1096561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1656901 - 2¹ = 1656899 is a prime.

Together with 1656899, it forms a pair of twin primes.

It is a Chen prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1656901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1656911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 828450 + 828451.

It is an arithmetic number, because the mean of its divisors is an integer number (828451).

2^1656901 is an apocalyptic number.

It is an amenable number.

1656901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1656901 is an equidigital number, since it uses as much as digits as its factorization.

1656901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 1656901 is about 1287.2066656136. The cubic root of 1656901 is about 118.3310868228.

The spelling of 1656901 in words is "one million, six hundred fifty-six thousand, nine hundred one".