1611851 has 2 divisors, whose sum is σ = 1611852. Its totient is φ = 1611850.

The previous prime is 1611809. The next prime is 1611853. The reversal of 1611851 is 1581161.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1611851 - 2¹⁸ = 1349707 is a prime.

Together with 1611853, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p₁₂₁₉₈₂ and since 1611851 and 121982 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 (1611853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 805925 + 805926.

It is an arithmetic number, because the mean of its divisors is an integer number (805926).

2^1611851 is an apocalyptic number.

1611851 is a deficient number, since it is larger than the sum of its proper divisors (1).

1611851 is an equidigital number, since it uses as much as digits as its factorization.

1611851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 240, while the sum is 23.

The square root of 1611851 is about 1269.5869407016. The cubic root of 1611851 is about 117.2487706025.

The spelling of 1611851 in words is "one million, six hundred eleven thousand, eight hundred fifty-one".