81769123 has 2 divisors, whose sum is σ = 81769124. Its totient is φ = 81769122.

The previous prime is 81769111. The next prime is 81769153. The reversal of 81769123 is 32196718.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81769123 - 2⁵ = 81769091 is a prime.

It is not a weakly prime, because it can be changed into another prime (81769153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40884561 + 40884562.

It is an arithmetic number, because the mean of its divisors is an integer number (40884562).

Almost surely, 2^81769123 is an apocalyptic number.

81769123 is a deficient number, since it is larger than the sum of its proper divisors (1).

81769123 is an equidigital number, since it uses as much as digits as its factorization.

81769123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 37.

The square root of 81769123 is about 9042.6281024932. The cubic root of 81769123 is about 434.0400251193.

The spelling of 81769123 in words is "eighty-one million, seven hundred sixty-nine thousand, one hundred twenty-three".