823172741 has 2 divisors, whose sum is σ = 823172742. Its totient is φ = 823172740.

The previous prime is 823172723. The next prime is 823172761. The reversal of 823172741 is 147271328.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 639027841 + 184144900 = 25279^2 + 13570^2 .

It is a cyclic number.

It is not a de Polignac number, because 823172741 - 2⁶ = 823172677 is a prime.

It is a super-2 number, since 2×823172741² = 1355226723050906162, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (823172761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411586370 + 411586371.

It is an arithmetic number, because the mean of its divisors is an integer number (411586371).

Almost surely, 2^823172741 is an apocalyptic number.

It is an amenable number.

823172741 is a deficient number, since it is larger than the sum of its proper divisors (1).

823172741 is an equidigital number, since it uses as much as digits as its factorization.

823172741 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18816, while the sum is 35.

The square root of 823172741 is about 28690.9871039670. The cubic root of 823172741 is about 937.1957852884.

It can be divided in two parts, 82317 and 2741, that added together give a palindrome (85058).

The spelling of 823172741 in words is "eight hundred twenty-three million, one hundred seventy-two thousand, seven hundred forty-one".