1787161 has 2 divisors, whose sum is σ = 1787162. Its totient is φ = 1787160.

The previous prime is 1787143. The next prime is 1787167. The reversal of 1787161 is 1617871.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1089936 + 697225 = 1044^2 + 835^2 .

It is an emirp because it is prime and its reverse (1617871) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1787161 - 2⁵ = 1787129 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1787167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 893580 + 893581.

It is an arithmetic number, because the mean of its divisors is an integer number (893581).

2^1787161 is an apocalyptic number.

It is an amenable number.

1787161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1787161 is an equidigital number, since it uses as much as digits as its factorization.

1787161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2352, while the sum is 31.

The square root of 1787161 is about 1336.8474108888. The cubic root of 1787161 is about 121.3541295581.

It can be divided in two parts, 17 and 87161, that added together give a palindrome (87178).

The spelling of 1787161 in words is "one million, seven hundred eighty-seven thousand, one hundred sixty-one".