1887161 has 2 divisors, whose sum is σ = 1887162. Its totient is φ = 1887160.

The previous prime is 1887143. The next prime is 1887167. The reversal of 1887161 is 1617881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1771561 + 115600 = 1331^2 + 340^2 .

It is a cyclic number.

It is not a de Polignac number, because 1887161 - 2¹⁴ = 1870777 is a prime.

It is a super-2 number, since 2×1887161² = 7122753279842, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1887167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 943580 + 943581.

It is an arithmetic number, because the mean of its divisors is an integer number (943581).

2^1887161 is an apocalyptic number.

It is an amenable number.

1887161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1887161 is an equidigital number, since it uses as much as digits as its factorization.

1887161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 32.

The square root of 1887161 is about 1373.7397861313. The cubic root of 1887161 is about 123.5766214690.

It can be divided in two parts, 1887 and 161, that added together give a 11-th power (2048 = 2¹¹).

The spelling of 1887161 in words is "one million, eight hundred eighty-seven thousand, one hundred sixty-one".