1931261 has 2 divisors, whose sum is σ = 1931262. Its totient is φ = 1931260.

The previous prime is 1931239. The next prime is 1931273. The reversal of 1931261 is 1621391.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1705636 + 225625 = 1306^2 + 475^2 .

It is an emirp because it is prime and its reverse (1621391) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1931261 - 2¹⁰ = 1930237 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1931291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 965630 + 965631.

It is an arithmetic number, because the mean of its divisors is an integer number (965631).

2^1931261 is an apocalyptic number.

It is an amenable number.

1931261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1931261 is an equidigital number, since it uses as much as digits as its factorization.

1931261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324, while the sum is 23.

The square root of 1931261 is about 1389.6981686683. The cubic root of 1931261 is about 124.5318166239.

The spelling of 1931261 in words is "one million, nine hundred thirty-one thousand, two hundred sixty-one".