1161851 has 2 divisors, whose sum is σ = 1161852. Its totient is φ = 1161850.

The previous prime is 1161841. The next prime is 1161857. The reversal of 1161851 is 1581611.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (1581611) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1161851 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1161857) 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, 580925 + 580926.

It is an arithmetic number, because the mean of its divisors is an integer number (580926).

2^1161851 is an apocalyptic number.

1161851 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161851 is an equidigital number, since it uses as much as digits as its factorization.

1161851 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 1161851 is about 1077.8919240814. The cubic root of 1161851 is about 105.1276150554.

Subtracting from 1161851 its product of digits (240), we obtain a palindrome (1161611).

It can be divided in two parts, 11 and 61851, that multiplied together give a triangular number (680361 = T₁₁₆₆).

The spelling of 1161851 in words is "one million, one hundred sixty-one thousand, eight hundred fifty-one".