123823681 has 2 divisors, whose sum is σ = 123823682. Its totient is φ = 123823680.

The previous prime is 123823663. The next prime is 123823723. The reversal of 123823681 is 186328321.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80263681 + 43560000 = 8959^2 + 6600^2 .

It is a cyclic number.

It is not a de Polignac number, because 123823681 - 2¹⁵ = 123790913 is a prime.

It is a super-2 number, since 2×123823681² = 30664607952779522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (123823081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61911840 + 61911841.

It is an arithmetic number, because the mean of its divisors is an integer number (61911841).

Almost surely, 2^123823681 is an apocalyptic number.

It is an amenable number.

123823681 is a deficient number, since it is larger than the sum of its proper divisors (1).

123823681 is an equidigital number, since it uses as much as digits as its factorization.

123823681 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 123823681 is about 11127.6089525109. The cubic root of 123823681 is about 498.4266288664.

The spelling of 123823681 in words is "one hundred twenty-three million, eight hundred twenty-three thousand, six hundred eighty-one".