1623161 has 2 divisors, whose sum is σ = 1623162. Its totient is φ = 1623160.

The previous prime is 1623157. The next prime is 1623163. The reversal of 1623161 is 1613261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1547536 + 75625 = 1244^2 + 275^2 .

It is a cyclic number.

It is not a de Polignac number, because 1623161 - 2² = 1623157 is a prime.

It is a Sophie Germain prime.

Together with 1623163, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a Curzon number.

It is equal to p₁₂₂₇₆₂ and since 1623161 and 122762 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (1623163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 811580 + 811581.

It is an arithmetic number, because the mean of its divisors is an integer number (811581).

2^1623161 is an apocalyptic number.

It is an amenable number.

1623161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1623161 is an equidigital number, since it uses as much as digits as its factorization.

1623161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 20.

The square root of 1623161 is about 1274.0333590609. The cubic root of 1623161 is about 117.5223678558.

The spelling of 1623161 in words is "one million, six hundred twenty-three thousand, one hundred sixty-one".