823381261 has 2 divisors, whose sum is σ = 823381262. Its totient is φ = 823381260.

The previous prime is 823381211. The next prime is 823381271. The reversal of 823381261 is 162183328.

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., 613305225 + 210076036 = 24765^2 + 14494^2 .

It is a cyclic number.

It is not a de Polignac number, because 823381261 - 2⁷ = 823381133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (823381211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411690630 + 411690631.

It is an arithmetic number, because the mean of its divisors is an integer number (411690631).

Almost surely, 2^823381261 is an apocalyptic number.

It is an amenable number.

823381261 is a deficient number, since it is larger than the sum of its proper divisors (1).

823381261 is an equidigital number, since it uses as much as digits as its factorization.

823381261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 34.

The square root of 823381261 is about 28694.6207676631. The cubic root of 823381261 is about 937.2749130974.

The spelling of 823381261 in words is "eight hundred twenty-three million, three hundred eighty-one thousand, two hundred sixty-one".