1658161 has 2 divisors, whose sum is σ = 1658162. Its totient is φ = 1658160.

The previous prime is 1658147. The next prime is 1658201. The reversal of 1658161 is 1618561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1366561 + 291600 = 1169^2 + 540^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1658161 is a prime.

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

1658161 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1658101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 829080 + 829081.

It is an arithmetic number, because the mean of its divisors is an integer number (829081).

2^1658161 is an apocalyptic number.

It is an amenable number.

1658161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1658161 is an equidigital number, since it uses as much as digits as its factorization.

1658161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 28.

The square root of 1658161 is about 1287.6960044980. The cubic root of 1658161 is about 118.3610744104.

The spelling of 1658161 in words is "one million, six hundred fifty-eight thousand, one hundred sixty-one".