1251161 has 2 divisors, whose sum is σ = 1251162. Its totient is φ = 1251160.

The previous prime is 1251157. The next prime is 1251179. The reversal of 1251161 is 1611521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 866761 + 384400 = 931^2 + 620^2 .

It is a cyclic number.

It is not a de Polignac number, because 1251161 - 2² = 1251157 is a prime.

It is a Chen prime.

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (1251101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625580 + 625581.

It is an arithmetic number, because the mean of its divisors is an integer number (625581).

2^1251161 is an apocalyptic number.

It is an amenable number.

1251161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251161 is an equidigital number, since it uses as much as digits as its factorization.

1251161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60, while the sum is 17.

The square root of 1251161 is about 1118.5530832285. The cubic root of 1251161 is about 107.7550748306.

Adding to 1251161 its reverse (1611521), we get a palindrome (2862682).

The spelling of 1251161 in words is "one million, two hundred fifty-one thousand, one hundred sixty-one".